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COPT DEFENSE PROPERTIES - Annual Report: 2010 (Form 10-K)


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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark one)    
ý   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2010

or

o

 

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                        to                         

Commission file number 1-14023

LOGO

Corporate Office Properties Trust
(Exact name of registrant as specified in its charter)

Maryland   23-2947217
(State or other jurisdiction of
incorporation or organization)
  (IRS Employer
Identification No.)

6711 Columbia Gateway Drive, Suite 300
Columbia, MD

 

21046
(Address of principal executive offices)   (Zip Code)

Registrant's telephone number, including area code: (443) 285-5400



Securities registered pursuant to Section 12(b) of the Act:

(Title of Each Class)
 
(Name of Exchange on Which Registered)
Common Shares of beneficial interest, $0.01 par value   New York Stock Exchange
Series G Cumulative Redeemable Preferred Shares of beneficial interest, $0.01 par value   New York Stock Exchange
Series H Cumulative Redeemable Preferred Shares of beneficial interest, $0.01 par value   New York Stock Exchange
Series J Cumulative Redeemable Preferred Shares of beneficial interest, $0.01 par value   New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

          Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. ý Yes o No

          Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. o Yes ý No

          Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ý Yes o No

          Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). ý Yes o No

          Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

          Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check One):

Large accelerated filer ý   Accelerated filer o   Non-accelerated filer o
(Do not check if a smaller
reporting company)
  Smaller reporting company o

          Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act.) o Yes ý No

          The aggregate market value of the voting and nonvoting common equity held by non-affiliates of the registrant was approximately $1.9 billion, as calculated using the closing price of the common shares of beneficial interest on the New York Stock Exchange and our outstanding shares as of June 30, 2010. For purposes of calculating this amount only, affiliates are defined as Trustees, executive owners and beneficial owners of more than 10% of the registrant's outstanding common shares of beneficial interest, $0.01 par value. At January 28, 2011, 66,938,717 of the registrant's common shares of beneficial interest were outstanding.

          Portions of the annual shareholders' report of the registrant for the year ended December 31, 2010 are incorporated by reference into Parts I and II of this Form 10-K and portions of the proxy statement of the registrant for its 2011 Annual Meeting of Shareholders to be filed within 120 days after the end of the fiscal year covered by this Form 10-K are incorporated by reference into Part III of this Form 10-K.


Table of Contents


Table of Contents

Form 10-K

PART I

       
 

ITEM 1.

 

BUSINESS

 
4
 

ITEM 1A.

 

RISK FACTORS

  9
 

ITEM 1B.

 

UNRESOLVED STAFF COMMENTS

  21
 

ITEM 2.

 

PROPERTIES

  22
 

ITEM 3.

 

LEGAL PROCEEDINGS

  39
 

ITEM 4.

 

REMOVED AND RESERVED

  39

PART II

       
 

ITEM 5.

 

MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

 
40
 

ITEM 6.

 

SELECTED FINANCIAL DATA

  42
 

ITEM 7.

 

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

  44
 

ITEM 7A.

 

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

  74
 

ITEM 8.

 

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

  75
 

ITEM 9.

 

CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

  75
 

ITEM 9A.

 

CONTROLS AND PROCEDURES

  75
 

ITEM 9B.

 

OTHER INFORMATION

  76

PART III

       
 

ITEM 10.

 

DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

 
77
 

ITEM 11.

 

EXECUTIVE COMPENSATION

  77
 

ITEM 12.

 

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

  77
 

ITEM 13.

 

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

  77
 

ITEM 14.

 

PRINCIPAL ACCOUNTANT FEES AND SERVICES

  77

PART IV

       
 

ITEM 15.

 

EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

 
77

FORWARD-LOOKING STATEMENTS

        This Form 10-K contains "forward-looking" statements, as defined in the Private Securities Litigation Reform Act of 1995, that are based on our current expectations, estimates and projections about future events and financial trends affecting the financial condition and operations of our business. Forward-looking statements can be identified by the use of words such as "may," "will," "should," "could," "believe," "anticipate," "expect," "estimate," "plan" or other comparable terminology. Forward-looking statements are inherently subject to risks and uncertainties, many of which we cannot predict with accuracy and some of which we might not even anticipate. Although we believe that the expectations, estimates and projections reflected in such forward-looking statements are based on reasonable assumptions at the time made, we can give no assurance that these expectations, estimates and projections will be achieved. Future events and actual results may differ materially from

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those discussed in the forward-looking statements. Important factors that may affect these expectations, estimates and projections include, but are not limited to:

    general economic and business conditions, which will, among other things, affect office property demand and rents, tenant creditworthiness, interest rates and financing availability;

    adverse changes in the real estate markets including, among other things, increased competition with other companies;

    our ability to borrow on favorable terms;

    risks of real estate acquisition and development activities, including, among other things, risks that development projects may not be completed on schedule, that tenants may not take occupancy or pay rent or that development and operating costs may be greater than anticipated;

    risks of investing through joint venture structures, including risks that our joint venture partners may not fulfill their financial obligations as investors or may take actions that are inconsistent with our objectives;

    changes in our plans for properties or views of market economic conditions or failure to obtain development rights, either of which could result in recognition of impairment losses;

    our ability to satisfy and operate effectively under Federal income tax rules relating to real estate investment trusts and partnerships;

    governmental actions and initiatives; and

    environmental requirements.

        For further information on factors that could affect the company and the statements contained herein, you should refer to the section below entitled "Item 1A. Risk Factors." We undertake no obligation to update or supplement forward-looking statements.

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PART I

Item 1.    Business

OUR COMPANY

        General.    We are a specialty office real estate investment trust ("REIT") that focuses primarily on strategic customer relationships and specialized tenant requirements in the United States Government and defense information technology sectors and data centers serving such sectors. We acquire, develop, manage and lease office and data center properties that are typically concentrated in large office parks primarily located adjacent to government demand drivers and/or in strong markets that we believe possess growth opportunities. As of December 31, 2010, our investments in real estate included the following:

    252 wholly owned operating office properties totaling 20.0 million square feet that were 88.2% occupied;

    21 wholly owned office properties under construction, development or redevelopment that we estimate will total approximately 3.0 million square feet upon completion, including five partially operational properties included above;

    wholly owned land parcels totaling 1,497 acres that we believe are potentially developable into approximately 14.4 million square feet;

    a wholly owned, partially operational, wholesale data center which upon completion is expected to have an initial stabilization critical load of 18 megawatts; and

    partial ownership interests through real estate joint ventures in the following:

    20 operating office properties containing approximately 1.1 million square feet that were 69.2% occupied;

    two office properties under development that we estimate will total approximately 235,000 square feet upon completion; and

    land parcels totaling 755 acres (including 563 acres under contract) that we believe are potentially developable into approximately 7.5 million square feet.

        We conduct almost all of our operations through our operating partnership, Corporate Office Properties, L.P. (the "Operating Partnership"), a Delaware limited partnership, of which we are the managing general partner. The Operating Partnership owns real estate both directly and through subsidiary partnerships and limited liability companies ("LLCs"). The Operating Partnership also owns 100% of a number of entities that provide real estate services such as property management, construction and development and heating and air conditioning services primarily for our properties, but also for third parties.

        Interests in our Operating Partnership are in the form of common and preferred units. As of December 31, 2010, we owned 93.6% of the outstanding common units and 95.8% of the outstanding preferred units in our Operating Partnership. The remaining common and preferred units in our Operating Partnership were owned by third parties, which included certain of our Trustees.

        We believe that we are organized and have operated in a manner that permits us to satisfy the requirements for taxation as a REIT under the Internal Revenue Code of 1986, as amended, and we intend to continue to operate in such a manner. If we qualify for taxation as a REIT, we generally will not be subject to Federal income tax on our taxable income that is distributed to our shareholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it distribute to its shareholders at least 90% of its annual taxable income (excluding net capital gains).

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        Our executive offices are located at 6711 Columbia Gateway Drive, Suite 300, Columbia, Maryland 21046 and our telephone number is (443) 285-5400.

        Our Internet address is www.copt.com. We make available on our Internet website free of charge our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably possible after we file such material with the Securities and Exchange Commission (the "SEC"). In addition, we have made available on our Internet website under the heading "Corporate Governance" the charters for our Board of Trustees' Audit, Nominating and Corporate Governance and Compensation Committees, as well as our Corporate Governance Guidelines, Code of Business Conduct and Ethics and Code of Ethics for Financial Officers. We intend to make available on our website any future amendments or waivers to our Code of Business Conduct and Ethics and Code of Ethics for Financial Officers within four business days after any such amendments or waivers. The information on our Internet site is not part of this report.

        The SEC maintains an Internet website that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. This Internet website can be accessed at www.sec.gov. The public may also read and copy paper filings that we have made with the SEC at the SEC's Public Reference Room, located at 100 F Street, NE, Washington, DC 20549. Information on the operation of the Public Reference Room may be obtained by calling (800) SEC-0330.

Significant 2010 Developments

        During 2010, we:

    finished the period with our wholly owned portfolio of operating office properties 88.2% occupied;

    acquired three operating office properties totaling 514,000 square feet and a shell-complete office property totaling 183,000 square feet for $205.1 million;

    placed into service an aggregate of 816,000 square feet in newly constructed space in nine office properties;

    completed the formation of LW Redstone Company, LLC, a joint venture created to develop Redstone Gateway, a 468-acre master-planned office business park adjacent to Redstone Arsenal in Huntsville, Alabama;

    entered the Springfield, Virginia submarket by acquiring 15 acres on which we are entitled to develop up to 978,000 square feet adjacent to the new National Geospatial Intelligence Agency (NGA) headquarters at Fort Belvoir;

    acquired a partially operational 233,000 square foot wholesale data center for $115.5 million that was 17% leased on the date of acquisition to two tenants that have a combined initial critical load of three megawatts and further expansion rights of up to a combined five megawatts. We expect to complete the development of the property to an initial stabilization critical load of 18 megawatts for additional development costs initially estimated at $166 million;

    issued a $240.0 million aggregate principal amount of 4.25% Exchangeable Senior Notes due in 2030, and redeemable by us, or subject to required repurchase upon request of the note holders, in April 2015 or thereafter as defined under the terms of the notes;

    issued 7.5 million common shares at a public offering price of $34.25 per share for net proceeds of $245.8 million after underwriting discounts but before offering expenses; and

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    increased the borrowing capacity under our unsecured revolving credit facility (the "Revolving Credit Facility") by $200.0 million, from $600.0 million to $800.0 million.

        In addition, our Board of Trustees, as part of an ongoing personnel development and succession program, elected Roger A. Waesche, Jr. to serve as President, in addition to his current duties as Chief Operating Officer. Randall M. Griffin, who had served as President and Chief Executive Officer, continued in his role as Chief Executive Officer.

Business and Growth Strategies

        Our primary objectives are to achieve sustainable long-term growth in results of operations and to maximize long-term shareholder value. This section sets forth key components of our business and growth strategies that we have in place to support these objectives.

Business Strategies

        Customer Strategy:    We believe that we differentiate ourselves by being a real estate company that does not view space in properties as its primary commodity. Rather, we focus our operations on serving the needs of our customers and enabling them to be successful. This strategy includes a focus on establishing and nurturing long-term relationships with quality tenants and accommodating their multi-locational needs. It also includes a focus on providing a level of service that exceeds customer expectations both in terms of the quality of the space we provide and our level of responsiveness to their needs. We believe that operating with such an emphasis on service enables us to be the landlord of choice with high quality customers and contributes to high levels of customer loyalty and retention.

        Our focus on customers in the United States Government and defense information technology sectors and data centers serving such sectors is a key aspect of our customer strategy. A high percentage of our revenue is derived from these customers, and we believe that we are well positioned for future growth through such customers for reasons that include the following:

    our strong relationships and reputation for high service levels that we have forged over the years and continue to emphasize;

    the proximity of our properties to government demand drivers (such as military installations) in various regions of the country and our willingness to expand to other regions where demand exists; and

    the depth of our collective team knowledge, experience and capabilities in developing and operating single user data centers and secure properties that meet the United States Government's Force Protection requirements.

        Market Strategy:    We focus on owning properties where our tenants want to be, which in the case of the United States Government and defense information technology customers is mostly near government demand drivers. We also concentrate our operations in markets and submarkets that are located where we believe we already possess, or can effectively achieve, the critical mass necessary to maximize management efficiencies, operating synergies and competitive advantages through our acquisition, property management, leasing and development activities. The attributes we look for in selecting markets and submarkets include, among others: (1) proximity to large demand drivers; (2) strong demographics; (3) attractiveness to high quality tenants; (4) potential for growth and stability in economic down cycles; (5) future acquisition and development opportunities; and (6) minimal competition from other property owners. We typically focus on owning and operating office properties in large business parks located outside of central business districts. We believe that such parks generally attract long-term, high-quality tenants seeking to attract and retain quality work forces because they are typically situated along major transportation routes with easy access to support services, amenities and residential communities.

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        Capital Strategy:    Our capital strategy is aimed at maintaining a flexible capital structure in order to facilitate growth and performance in the face of differing market conditions in the most cost-effective manner by:

    using debt comprised primarily of mortgage and other secured loans, our unsecured revolving credit facility and exchangeable senior notes;

    using equity raised through issuances of common and preferred shares of beneficial interest, issuances of common and preferred units in our Operating Partnership and, to a lesser extent, joint venture structures for certain investments;

    managing our debt by monitoring, among other things: (1) our debt levels relative to our overall capital structure; (2) the relationship of certain measures of earnings to certain financing cost requirements (commonly referred to as coverage ratios); (3) the relationship of our total variable-rate debt to our total debt; and (4) the timing of debt maturities to ensure that maturities in any year do not exceed levels that we believe we can refinance; and

    continuously evaluating the ability of our capital resources to accommodate our plans for future growth.

        Sustainability Strategy:    We are focused on developing and operating our properties in a manner that minimizes global impact for the environment and have been committed to this effort since 2003. Our strategy includes:

    constructing new buildings that are designed to use resources with a higher level of efficiency and lower impact on human health and the environment during their life cycles than conventional buildings. An example of our focus in this area is our participation in the U.S. Green Building Council's Leadership in Energy and Environmental Design ("LEED") program, which has a rigorous certification process for evaluating and rating buildings in order for such buildings to qualify for the program's Certified, Silver, Gold and Platinum ratings;

    retrofitting select existing office properties to also become certified LEED-Existing Building ("LEED-EB");

    registering our property portfolio in Energy Star, a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy that focuses on protecting the environment through energy efficient products and practices; and

    implementing LEED-EB prerequisites as standard operating procedure for key aspects of our property operations and management.

        We believe that our commitment to sustainability is evident in the fact that as of December 31, 2010, we had ten buildings certified LEED Gold, 13 buildings certified LEED Silver, one building certified LEED, two buildings certified LEED-EB and 31 other buildings registered in the LEED program, and we had 17 professionals on staff who hold the LEED Accredited Professional designation. We also have established an internal goal to have 50% of our portfolio be brought up to LEED certification standards by 2015. We believe that this strategy is important not just because our customers will demand it, but also because it is the right thing to do.

Growth Strategies

        Acquisition and Property Development Strategy:    We pursue acquisition and property development opportunities for properties that support our customer and market strategies discussed above. As a result, the focus of our acquisition and development activities includes properties that are either: (1) located near demand drivers that we believe are attractive to customers in the United States Government and defense information technology sectors and data centers serving such sectors or

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(2) located in markets or submarkets that we believe meet the criteria set forth above in our market strategy. We may also acquire or develop properties that do not align with our customer or market strategies but which we believe provide opportunity for favorable returns on investment given the associated risks.

        We typically seek to make acquisitions at attractive yields and below replacement cost. We also seek to increase operating cash flow of certain acquisitions by repositioning the properties and capitalizing on existing below market leases and expansion opportunities. We pursue development activities as market conditions and leasing opportunities support favorable risk-adjusted returns on investment.

        Internal Growth Strategy:    We aggressively manage our portfolio to maximize the operating performance of each property through: (1) proactive property management and leasing; (2) achieving operating efficiencies through increasing economies of scale and, where possible, aggregating vendor contracts to achieve volume pricing discounts; and (3) renewing tenant leases and re-tenanting at increased rents where market conditions permit.

Industry Segments

        We operate in two primary industries: commercial office real estate and wholesale data centers. We classify our properties containing data center space as commercial office real estate when tenants significantly funded the data center infrastructure costs. At December 31, 2010, our commercial office real estate operations had nine primary geographical segments, as set forth below:

    Baltimore/Washington Corridor (generally defined as the Maryland counties of Howard and Anne Arundel);

    Northern Virginia (defined as Fairfax County, Virginia);

    Suburban Maryland (defined as the Maryland counties of Montgomery, Prince George's and Frederick);

    Washington, DC—Capitol Riverfront;

    St. Mary's & King George Counties (in Maryland and Virginia, respectively);

    Greater Baltimore, Maryland (generally defined as the Maryland counties of Baltimore and Harford and Baltimore City);

    Colorado Springs, Colorado;

    San Antonio, Texas; and

    Greater Philadelphia, Pennsylvania.

        As of December 31, 2010, 153 of our wholly owned office properties were located in what is widely known as the Greater Washington, DC region, which includes the first five regions set forth above, and 66 were located in neighboring Greater Baltimore. At December 31, 2010, we also owned 21 wholly owned office properties in Colorado Springs and eight in San Antonio. In addition, we owned two office properties as of December 31, 2010 in Greater Philadelphia that are considered non-core to the Company. Our wholesale data center, which is comprised of one property in Manassas, Virginia, is reported as a separate segment.

        For information relating to our segments, you should refer to Note 16 to our consolidated financial statements, which is included in a separate section at the end of this Annual Report on Form 10-K beginning on page F-1.

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Employees

        As of December 31, 2010, we had 411 employees, none of whom were parties to collective bargaining agreements. We believe that our relations with our employees are good.

Competition

        The commercial real estate market is highly competitive. Numerous commercial properties compete with our properties for tenants. Some of the properties competing with ours may be newer or have more desirable locations, or the competing properties' owners may be willing to accept lower rents than are acceptable to us. We also compete with our own tenants, many of whom have the right to sublease their space. The competitive environment for leasing is affected considerably by a number of factors including, among other things, changes in economic factors and supply of and demand for space. These factors may make it difficult for us to lease existing vacant space and space associated with future lease expirations at rental rates that are sufficient to meeting our short-term capital needs.

        We also compete for the acquisition of commercial properties with many entities, including other publicly-traded commercial REITs. Many of our competitors for such acquisitions have substantially greater financial resources than ours. In addition, our competitors may be willing to accept lower returns on their investments. If our competitors prevent us from buying properties that we have targeted for acquisition, we may not be able to meet our property acquisition goals.

Item 1A.    Risk Factors

        Set forth below are risks and uncertainties relating to our business and the ownership of our securities. You should carefully consider each of these risks and uncertainties and all of the information in this Annual Report on Form 10-K and its Exhibits, including our consolidated financial statements and notes thereto for the year ended December 31, 2010, which are included in a separate section at the end of this report beginning on page F-1.

        Our performance and value are subject to risks associated with our properties and with the real estate industry.    Real estate investments are subject to various risks and fluctuations in value and demand, many of which are beyond our control. Our economic performance and the value of our real estate assets may decline due to conditions in the general economy and the real estate business which, in turn, could have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders. These conditions include, but are not limited to:

    downturns in national, regional and local economic environments, including increases in the unemployment rate and inflation or deflation;

    competition from other properties;

    deteriorating local real estate market conditions, such as oversupply, reduction in demand and decreasing rental rates;

    declining real estate valuations and impairment charges;

    increasing vacancies and the need to periodically repair, renovate and re-lease space;

    adverse developments concerning our tenants, which could affect our ability to collect rents and execute lease renewals;

    increasing operating costs, including insurance expense, utilities, real estate taxes and other expenses, much of which we may not be able to pass through to tenants;

    increasing interest rates and unavailability of financing on acceptable terms or at all;

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    trends in office real estate that may adversely affect future demand, including telecommuting and flexible workplaces that increase the population density per square foot;

    adverse changes in taxation or zoning laws;

    potential inability to secure adequate insurance;

    adverse consequences resulting from civil disturbances, natural disasters, terrorist acts or acts of war; and

    potential liability under environmental or other laws or regulations.

        We may suffer adverse consequences as a result of recent and future economic events.    Since the latter part of 2007, the United States and world economies have struggled through difficult conditions, including a significant recession. This slowdown has had devastating effects on the capital markets, with tightening credit availability. The commercial real estate industry was affected by these events over the last four years and, we believe, will likely continue to be affected at least through 2011. These events could adversely affect us in numerous ways discussed throughout this Annual Report on Form 10-K. The real estate industry in general has encountered increased difficulty in obtaining capital to fund growth activities, such as acquisitions and development costs, debt repayments and other capital requirements. As a result, the level of risk that we may not be able to obtain new financing for acquisitions, development activities, refinancing of existing debt or other capital requirements at reasonable terms, if at all, has increased. We believe that there is an increased likelihood in the current economic climate of tenants encountering financial difficulties, including bankruptcy, insolvency or general downturn of business, and as a result there is an increased likelihood of such tenants defaulting in their lease obligations to us. We also expect that our leasing activities will be adversely affected, with an increased likelihood of our being unsuccessful in renewing tenants, renewing tenants on terms less favorable to us or being unable to lease newly constructed properties. As a result, the conditions brought about by these economic events could collectively have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We are dependent on external sources of capital for future growth.    Because we are a REIT, we must distribute at least 90% of our annual taxable income to our shareholders. Due to this requirement, we are not able to significantly fund our acquisition, construction and development activities using cash flow from operations. Therefore, our ability to fund these activities is dependent on our ability to access capital funded by third parties. Such capital could be in the form of new debt, equity issuances of common shares, preferred shares, common and preferred units in our Operating Partnership or joint venture funding. These capital sources may not be available on favorable terms or at all. Since the United States financial markets have recently experienced extreme volatility and, as a result, credit markets have tightened considerably, the level of risk that we may not be able to obtain new financing for acquisitions, development activities or other capital requirements at reasonable terms, if at all, has increased. Moreover, additional debt financing may substantially increase our leverage and subject us to covenants that restrict management's flexibility in directing our operations, and additional equity offerings may result in substantial dilution of our shareholders' interests. Our inability to obtain capital when needed could have a material adverse effect on our ability to expand our business and fund other cash requirements.

        We use our Revolving Credit Facility to initially finance much of our investing and financing activities. We also use a construction loan agreement with an aggregate commitment by the lenders that is restorable (the "Revolving Construction Facility") and other credit facilities to fund a significant portion of our construction activities. Our lenders under these and other facilities could, for financial hardship or other reasons, fail to honor their commitments to fund our requests for borrowings under these facilities. In the event that one or more lenders under these facilities are not able or willing to

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fund a borrowing request, it would adversely affect our ability to access borrowing capacity under these facilities, which would in turn adversely affect our financial condition, cash flows and ability to make expected distributions to our shareholders.

        We may suffer adverse consequences as a result of our reliance on rental revenues for our income.    We earn revenue from renting our properties. Our operating costs do not necessarily fluctuate in relation to changes in our rental revenue. This means that our costs will not necessarily decline and may increase even if our revenues decline.

        For new tenants or upon lease expiration for existing tenants, we generally must make improvements and pay other leasing costs for which we may not receive increased rents. We also make building-related capital improvements for which tenants may not reimburse us.

        If our properties do not generate revenue sufficient to meeting our operating expenses and capital costs, we may have to borrow additional amounts to cover these costs. In such circumstances, we would likely have lower profits or possibly incur losses. We may also find in such circumstances that we are unable to borrow to cover such costs, in which case our operations could be adversely affected. Moreover, there may be less or no cash available for distributions to our shareholders.

        In addition, the competitive environment for leasing is affected considerably by a number of factors including, among other things, changes due to economic factors such as supply and demand. These factors may make it difficult for us to lease existing vacant space and space associated with future lease expirations at rental rates that are sufficient to meeting our short-term capital needs.

        We rely on the ability of our tenants to pay rent and would be harmed by their inability to do so.    Our performance depends on the ability of our tenants to fulfill their lease obligations by paying their rental payments in a timely manner. If one or more of our major tenants, or a number of our smaller tenants, were to experience financial difficulties, including bankruptcy, insolvency or general downturn of business, there could be an adverse effect on financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may be adversely affected by developments concerning some of our major tenants and sector concentrations.    As of December 31, 2010, our 20 largest tenants accounted for 58.1% of the total annualized rental revenue of our wholly owned office properties, and our four largest of these tenants accounted for 64.2% of that total. We compute the annualized rental revenue by multiplying by 12 the sum of monthly contractual base rents and estimated monthly expense reimbursements under active leases in our portfolio of wholly owned properties as of December 31, 2010. Information regarding our four largest tenants is set forth below:

Tenant
  Annualized
Rental Revenue at
December 31, 2010
  Percentage of Total
Annualized Rental
Revenue of Wholly
Owned Office Properties
  Number
of Leases
 
 
  (in thousands)
   
   
 

United States of America

  $ 95,049     21.1 %   74  

Northrop Grumman Corporation(1)

    32,857     7.3 %   17  

Booz Allen Hamilton, Inc. 

    21,311     4.7 %   8  

Computer Sciences Corporation(1)

    18,788     4.2 %   6  

(1)
Includes affiliated organizations and agencies and predecessor companies.

        Most of our leases with the United States Government provide for a series of one-year terms or provide for early termination rights. The United States Government may terminate its leases if, among other reasons, the United States Congress fails to provide funding. If any of our four largest tenants fail to make rental payments to us or if the United States Government elects to terminate several of its

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leases and the space cannot be re-leased on satisfactory terms, there would be an adverse effect on our financial performance and ability to make distributions to our shareholders.

        As of December 31, 2010, our properties that were occupied primarily by tenants in the United States Government and defense information technology sectors and data centers serving such sectors accounted for 58.7% of the total annualized rental revenue of our wholly owned office properties. We expect to increase our reliance on these sectors for revenue. A reduction in government spending targeting these sectors could affect the ability of these tenants to fulfill lease obligations or decrease the likelihood that these tenants will renew their leases. Moreover, a reduction in government spending targeting these sectors could limit our future growth. Such occurrences could have an adverse effect on our results of operations, financial condition, cash flows and ability to make distributions to our shareholders. We generally classify the revenue from our leases into this sector grouping based solely on management's knowledge of the tenants' operations in leased space. Occasionally, classifications require subjective and complex judgments. We do not use independent sources such as Standard Industrial Classification codes for classifying our revenue into sector groupings and if we did, the resulting groupings would be materially different.

        Most of our properties are geographically concentrated in the Mid-Atlantic region, particularly in the Greater Washington, DC region and neighboring Greater Baltimore, or in particular office parks. We may suffer economic harm in the event of a decline in the real estate market or general economic conditions in those regions or parks. Most of our properties are located in the Mid-Atlantic region of the United States and, as of December 31, 2010, our properties located in the Greater Washington, DC region and neighboring Greater Baltimore accounted for a combined 85.4% of our total annualized rental revenue from wholly owned office properties. Our properties are also typically concentrated in office parks in which we own most of the properties. Consequently, we do not have a broad geographic distribution of our properties. As a result, a decline in the real estate market or general economic conditions in the Mid-Atlantic region, the Greater Washington, DC region or the office parks in which our properties are located could have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We would suffer economic harm if we were unable to renew our leases on favorable terms.    When leases expire, our tenants may not renew or may renew on terms less favorable to us than the terms of their original leases. If a tenant vacates a property, we can expect to experience a vacancy for some period of time, as well as incur higher leasing costs than we would likely incur if a tenant renews. As a result, our financial performance and ability to make expected distributions to our shareholders could be adversely affected if we experience a high volume of tenant departures at the end of their lease terms. We expect that the effects of the global downturn on our real estate operations will make our leasing activities particularly challenging at least through 2011 and, as a result, there could be an increased likelihood of our being unsuccessful in renewing tenants or renewing on terms less favorable to us than the terms of the original leases. Set forth below are the percentages of total annualized rental revenue from wholly owned office properties as of December 31, 2010 that are subject to scheduled lease expirations in each of the next five years:

2011

    10.4 %

2012

    12.7 %

2013

    13.3 %

2014

    10.9 %

2015

    14.5 %

        As noted above, most of the leases with our largest tenant, the United States Government, provide for consecutive one-year terms or provide for early termination rights. All of the leasing statistics set forth above assume that the United States Government will remain in the space that it leases through

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the end of the respective arrangements, without ending consecutive one-year leases prematurely or exercising early termination rights.

        We may be adversely affected by trends in the office real estate industry.    Some businesses are rapidly evolving to make employee telecommuting, flexible work schedules, open workplaces and teleconferencing increasingly common. These practices enable businesses to reduce their space requirements. A continuation of the movement towards these practices could over time erode the overall demand for office space and, in turn, place downward pressure on occupancy, rental rates and property valuations, each of which could have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may encounter a decline in the value of our real estate.    The value of our real estate could be adversely affected by general economic and market conditions connected to a specific property, a market or submarket, a broader economic region or the office real estate industry. Examples of such conditions include a broader economic recession, declining demand and decreases in market rental rates and/or market values of real estate assets. If our real estate assets decline in value, it could result in our recognition of impairment losses. Moreover, a decline in the value of our real estate could adversely affect the amount of borrowings available to us under credit facilities and other loans, which could, in turn, adversely affect our cash flows and financial condition.

        We may not be able to compete successfully with other entities that operate in our industry.    The commercial real estate market is highly competitive. We compete for the purchase of commercial property with many entities, including other publicly traded commercial REITs. Many of our competitors have substantially greater financial resources than we do. If our competitors prevent us from buying properties that we target for acquisition, we may not be able to meet our property acquisition goals. Moreover, numerous commercial properties compete for tenants with our properties. Some of the properties competing with ours may be newer or in more desirable locations, or the competing properties' owners may be willing to accept lower rates than are acceptable to us. Competition for property acquisitions, or for tenants of properties that we own, could have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may be unable to successfully execute our plans to acquire existing commercial real estate properties.    We intend to acquire existing commercial real estate properties to the extent that suitable acquisitions can be made on advantageous terms. Acquisitions of commercial properties entail risks, such as the risks that we may not be in a position, or have the opportunity in the future, to make suitable property acquisitions on advantageous terms and/or that such acquisitions will fail to perform as expected. The failure of our acquisitions to perform as expected could adversely affect our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may be exposed to unknown liabilities from acquired properties.    We may acquire properties that are subject to liabilities in situations where we have no recourse, or only limited recourse, against the prior owners or other third parties with respect to unknown liabilities. As a result, if a liability were asserted against us based upon ownership of those properties, we might have to pay substantial sums to settle or contest it, which could adversely affect our results of operations and cash flow. Examples of unknown liabilities with respect to acquired properties include, but are not limited to:

    liabilities for clean-up of disclosed or undisclosed environmental contamination;

    claims by tenants, vendors or other persons dealing with the former owners of the properties;

    liabilities incurred in the ordinary course of business; and

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    claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.

        We may suffer economic harm as a result of making unsuccessful acquisitions in new markets.    We may pursue selective acquisitions of properties in regions where we have not previously owned properties. These acquisitions may entail risks in addition to those we face in other acquisitions where we are familiar with the regions, such as the risk that we do not correctly anticipate conditions or trends in a new market and are therefore not able to operate the acquired property profitably. If this occurs, it could adversely affect our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may be unable to execute our plans to develop and construct additional properties.    Although the majority of our investments are in currently leased properties, we also develop, construct and redevelop properties, including some that are not fully pre-leased. When we develop, construct and redevelop properties, we assume the risk that actual costs will exceed our budgets, that we will experience conditions which delay or preclude project completion and that projected leasing will not occur, any of which could adversely affect our financial performance, results of operations and our ability to make distributions to our shareholders; the risk of projected leasing not occurring has increased as a result of the recent economic conditions. In addition, we generally do not obtain construction financing commitments until the development stage of a project is complete and construction is about to commence. We may find that we are unable to obtain financing needed to continue with the construction activities for such projects.

        We may suffer adverse consequences due to our inexperience in developing, managing and leasing wholesale data centers.    We have significant experience in developing, managing and leasing single user data center space in which tenants significantly funded the data center infrastructure costs. However, we do not have the same depth and length of experience in relation to wholesale data centers, having acquired our first wholesale data center in 2010. This may increase the likelihood of us being unsuccessful in executing our plans with respect to our existing wholesale data center or any such centers that we may acquire or develop in the future. If we are unsuccessful in executing our wholesale data center plans, it could adversely affect our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        Our data centers may become obsolete.    Data centers are much more expensive investments on a per square foot basis than office properties due to the level of infrastructure required to operate the centers. At the same time, technology, industry standards and service requirements for data centers are rapidly evolving and, as a result, the risk of investments we make in data centers becoming obsolete is higher than office properties. Our data centers may become obsolete due to the development of new systems to deliver power to or eliminate heat from the servers housed in the properties. Our data centers could also become obsolete from new server technology that requires less critical load and heat removal than our facilities are designed to provide. In addition, we may not be able to efficiently upgrade or change power and cooling systems to meet new demands or industry standards without incurring significant costs that we may not be able to pass on to our tenants. The obsolescence of our data centers could adversely affect our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        Certain of our properties containing data centers contain space not suitable for lease other than as data centers, which could make it difficult or impractical to reposition them for alternative use. Certain of our properties contain data center space, which is highly specialized space containing extensive electrical and mechanical systems that are designed uniquely to run and maintain banks of computer servers. As a result, in the event we needed to reposition such data center space for another use, major renovations and expenditures could be required.

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        We may suffer adverse effects as a result of the indebtedness that we carry and the terms and covenants that relate to this debt.    Many of our properties are pledged by us to support repayment on indebtedness. In addition, we rely on borrowings to fund some or all of the costs of new property acquisitions, construction and development activities and other items. Our organizational documents do not limit the amount of indebtedness that we may incur.

        Payments of principal and interest on our debt may leave us with insufficient cash to operate our properties or pay distributions to our shareholders required to maintain our qualification as a REIT. We are also subject to the risks that:

    we may not be able to refinance our existing indebtedness, or may refinance on terms that are less favorable to us than the terms of our existing indebtedness;

    in the event of our default under the terms of our Revolving Credit Facility, our Operating Partnership could be restricted from making cash distributions to us, which could result in reduced distributions to our shareholders or the need for us to incur additional debt to fund these distributions;

    if we are unable to pay our debt service on time or are unable to comply with restrictive financial covenants in certain of our debt, our lenders could foreclose on our properties securing such debt and, in some cases, other properties and assets that we own.

        Some of our debt is cross-defaulted, which means that failure to pay interest or principal on the debt above a threshold value will create a default on certain of our other debt. In addition, some of our debt which is cross-defaulted also contains cross-collateralization provisions, which means that the collateral of the debt can also be used as collateral for certain of our other debt. Any foreclosure of our properties could result in loss of income and asset value that would negatively affect our financial condition, results of operations, cash flows and ability to make expected distributions to our shareholders. In addition, if we are in default and the value of the properties securing a loan is less than the loan balance, we may be required to pay the resulting shortfall to the lender using other assets.

        As of December 31, 2010, 22% of our debt had variable interest rates, including the effect of interest rate swaps. If short-term interest rates were to rise, our debt service payments on debt with variable interest rates would increase, which would lower our net income and could decrease our distributions to our shareholders. We use interest rate swap agreements from time to time to reduce the impact of changes in interest rates. Decreases in interest rates would result in increased interest payments due under interest rate swap agreements in place and, in the event we decided to unwind such agreements, could result in our recognizing a loss and remitting a payment.

        We must refinance our debt in the future. As of December 31, 2010, our scheduled debt payments over the next five years, including maturities, were as follows:

Year
  Amount(1)  
 
  (in thousands)
 

2011

  $ 733,739 (2)

2012

    271,390  

2013

    146,049  

2014

    210,225  

2015

    396,473  

(1)
Represents principal maturities only and therefore excludes premiums and discounts.

(2)
Includes $142.3 million in maturities that were extended to 2012 in January 2011 and an additional $311.8 million that may also be extended for one year, subject to certain conditions.

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Our operations likely will not generate enough cash flow to repay some or all of this debt without additional borrowings, equity issuances and/or property sales. If we cannot refinance our debt, extend the repayment dates, or raise additional equity prior to the dates when our debt matures, we would default on our existing debt, which would have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may incur additional indebtedness, which may harm our financial position and cash flow and potentially impact our ability to pay dividends on any series of preferred shares.    Our governing documents do not limit us from incurring additional indebtedness and other liabilities. As of December 31, 2010, we had $2.3 billion of consolidated indebtedness outstanding. We may incur additional indebtedness and become more highly leveraged, which could harm our financial position and potentially limit our cash available to pay dividends. As a result, we may not have sufficient funds remaining to satisfy our dividend obligations relating to any series of preferred shares if we incur additional indebtedness.

        We have certain distribution requirements that reduce cash available for other business purposes.    As a REIT, we must distribute at least 90% of our annual taxable income (excluding capital gains), which limits the amount of cash we can retain for other business purposes, including amounts to fund acquisitions and development activity. Also, it is possible that because of the differences between the time we actually receive revenue or pay expenses and the period during which we report those items for distribution purposes, we may have to borrow funds to meet the 90% distribution requirement.

        We may be unable to continue to make shareholder distributions at expected levels.    We expect to make regular quarterly cash distributions to our shareholders. However, our ability to make such distributions depends on a number of factors, some of which are beyond our control. Some of our loan agreements contain provisions that could restrict future distributions. Our ability to make distributions at expected levels will also be dependent, in part, on other matters, including, but not limited to:

    continued property occupancy and timely receipt of rent obligations;

    the amount of future capital expenditures and expenses relating to our properties;

    the level of leasing activity and future rental rates;

    the strength of the commercial real estate market;

    our ability to compete;

    our costs of compliance with environmental and other laws;

    our corporate overhead levels;

    our amount of uninsured losses; and

    our decision to reinvest in operations rather than distribute available cash.

In addition, we can make distributions to the holders of our common shares only after we make preferential distributions to holders of our preferred shares.

        Our ability to pay dividends may be limited, and we cannot provide assurance that we will be able to pay dividends regularly.    Because we conduct substantially all of our operations through our Operating Partnership, our ability to pay dividends will depend almost entirely on payments and distributions received on our interests in our Operating Partnership, the payment of which depends in turn on our ability to operate profitably and generate cash flow from our operations. We cannot guarantee that we will be able to pay dividends on a regular quarterly basis in the future. Additionally, the terms of some of the debt to which our Operating Partnership is a party limit its ability to make some types of payments and other distributions to us. This in turn limits our ability to make some types of payments, including payment of dividends on common or preferred shares, unless we meet certain

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financial tests or such payments or dividends are required to maintain our qualification as a REIT. As a result, if we are unable to meet the applicable financial tests, we may not be able to pay dividends on our shares in one or more periods. Furthermore, any new shares of beneficial interest issued will substantially increase the cash required to continue to pay cash dividends at current levels. Any common or preferred shares that may in the future be issued for financing acquisitions, share-based compensation arrangements or otherwise would have a similar effect.

        Our ability to pay dividends on preferred shares is further limited by the requirements of Maryland law.    As a Maryland REIT, we may not under applicable Maryland law make a distribution if either of the following conditions exist after giving effect to the distribution: (1) the REIT would not be able to pay its debts as the debts become due in the usual course of business; or (2) the REIT's total assets would be less than the sum of its total liabilities plus the amount that would be needed, if the REIT were dissolved at the time of the distribution, to satisfy the preferential rights upon dissolution of shareholders whose preferential rights are superior to those receiving the distribution. Therefore, we may not make a distribution on any series of preferred shares if either of the above described conditions exists after giving effect to the distribution.

        We may issue additional common or preferred shares that dilute our shareholders' interests.    We may issue additional common shares and preferred shares without shareholder approval. Similarly, we may cause the Operating Partnership to issue its common or preferred units for contributions of cash or property without approval by the limited partners of the Operating Partnership or our shareholders. Our existing shareholders' interests could be diluted if such additional issuances were to occur.

        Real estate investments are illiquid, and we may not be able to sell our properties on a timely basis when we determine it is appropriate to do so.    Real estate investments can be difficult to sell and convert to cash quickly, especially if market conditions are not favorable, and we may find that to be increasingly the case under the current economic conditions due to a lack of credit availability for potential buyers. Such illiquidity could limit our ability to quickly change our portfolio of properties in response to changes in economic or other conditions. Moreover, under certain circumstances, the Internal Revenue Code imposes certain penalties on a REIT that sells property held for less than two years and limits the number of properties it can sell in a given year. In addition, for certain of our properties that we acquired by issuing units in our Operating Partnership, we are restricted by agreements with the sellers of the properties for a certain period of time from entering into transactions (such as the sale or refinancing of the acquired property) that will result in a taxable gain to the sellers without the seller's consent. Due to these factors, we may be unable to sell a property at an advantageous time.

        We may suffer economic harm as a result of the actions of our partners in real estate joint ventures and other investments.    We invest in certain entities in which we are not the exclusive investor or principal decision maker. Investments in such entities may, under certain circumstances, involve risks not present when a third party is not involved, including the possibility that the other parties to these investments might become bankrupt or fail to fund their share of required capital contributions. Our partners in these entities may have economic, tax or other business interests or goals which are inconsistent with our business interests or goals, and may be in a position to take actions contrary to our policies or objectives. Such investments may also lead to impasses, for example, as to whether to sell a property, because neither we nor the other parties to these investments may have full control over the entity. In addition, we may in certain circumstances be liable for the actions of the other parties to these investments. Each of these factors could have an adverse effect on our financial condition, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may need to make additional cash outlays to protect our investment in loans we make that are subordinate to other loans.    We have made and may in the future make loans under which we have a

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secured interest in the ownership of a property that is subordinate to other loans on the property. If a default were to occur under the terms of any such loans with us or under the first mortgage loans related to the properties on such loans, we may be in a position where, in order to protect our investment, we would need to either (1) purchase the other loan or (2) foreclose on the ownership interest in the property and repay the first mortgage loan, either of which could have an adverse effect on our financial condition, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may be subject to possible environmental liabilities.    We are subject to various Federal, state and local environmental laws, including air and water quality, hazardous or toxic substances and health and safety. These laws can impose liability on current and prior property owners or operators for the costs of removal or remediation of hazardous substances released on a property, even if the property owner was not responsible for, or even aware of, the release of the hazardous substances. Costs resulting from environmental liability could be substantial. The presence of hazardous substances on our properties may also adversely affect occupancy and our ability to sell or borrow against those properties. In addition to the costs of government claims under environmental laws, private plaintiffs may bring claims for personal injury or other reasons. Additionally, various laws impose liability for the costs of removal or remediation of hazardous substances at the disposal or treatment facility. Anyone who arranges for the disposal or treatment of hazardous substances at such a facility is potentially liable under such laws. These laws often impose liability on an entity even if the facility was not owned or operated by the entity.

        Although most of our properties have been subject to varying degrees of environmental assessment, many of these assessments are limited in scope and may not include or identify all potential environmental liabilities or risks associated with the property. Identification of new compliance concerns or undiscovered areas of contamination, changes in the extent or known scope of contamination, discovery of additional sites, human exposure to the contamination or changes in cleanup or compliance requirements could result in significant costs to us that could have an adverse effect on our financial condition, results of operations, cash flows and ability to make expected distributions to our shareholders.

        Terrorist attacks, such as those of September 11, 2001, may adversely affect the value of our properties, our financial position and cash flows.    We have significant investments in properties located in large metropolitan areas and near military installations. Future terrorist attacks could directly or indirectly damage our properties or cause losses that materially exceed our insurance coverage. After such an attack, tenants in these areas may choose to relocate their businesses to areas of the United States that may be perceived to be less likely targets of future terrorist activity, and fewer customers may choose to patronize businesses in these areas. This in turn would trigger a decrease in the demand for space in these areas, which could increase vacancies in our properties and force us to lease space on less favorable terms. As a result, the occurrence of terrorist attacks could adversely affect our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders.

        We may be subject to other possible liabilities that would adversely affect our financial position and cash flows.    Our properties may be subject to other risks related to current or future laws, including laws benefiting disabled persons, state or local laws relating to zoning, construction, fire and life safety requirements and other matters. These laws may require significant property modifications in the future and could result in the levy of fines against us. In addition, although we believe that we adequately insure our properties, we are subject to the risk that our insurance may not cover all of the costs to restore a property that is damaged by a fire or other catastrophic events, including acts of war or, as mentioned above, terrorism. The occurrence of any of these events could have an adverse effect on our financial condition, results of operations, cash flows and ability to make expected distributions to our shareholders.

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        We may be subject to increased costs of insurance and limitations on coverage, particularly regarding acts of terrorism.    Our portfolio of properties is insured for losses under our property, casualty and umbrella insurance policies through September 30, 2011. These policies include coverage for acts of terrorism. Future changes in the insurance industry's risk assessment approach and pricing structure may increase the cost of insuring our properties and decrease the scope of insurance coverage, either of which could adversely affect our financial position and operating results. Most of our loan agreements contain customary covenants requiring us to maintain insurance. Although we believe that we have adequate insurance coverage for purposes of these agreements, we may not be able to obtain an equivalent amount of coverage at reasonable costs, or at all, in the future. In addition, if lenders insist on greater coverage than we are able to obtain, it could adversely affect our ability to finance and/or refinance our properties and execute our growth strategies, which, in turn, would have an adverse effect on our financial condition, results of operations, cash flows and ability to make expected distributions to our shareholders.

        Our business could be adversely affected by a negative audit by the United States Government.    Agencies of the United States, including the Defense Contract Audit Agency and various agency Inspectors General, routinely audit and investigate government contractors. These agencies review a contractor's performance under its contracts, cost structure and compliance with applicable laws, regulations, and standards. The United States Government also reviews the adequacy of, and a contractor's compliance with, its internal control systems and policies. Any costs found to be misclassified may be subject to repayment. If an audit or investigation uncovers improper or illegal activities, we may be subject to civil or criminal penalties and administrative sanctions, including termination of contracts, forfeiture of profits, suspension of payments, fines, and suspension or prohibition from doing business with the United States Government. In addition, we could suffer serious reputational harm if allegations of impropriety were made against us.

        Our ownership limits are important factors.    Our Declaration of Trust limits ownership of our common shares by any single shareholder to 9.8% of the number of the outstanding common shares or 9.8% of the value of the outstanding common shares, whichever is more restrictive. Our Declaration of Trust also limits ownership by any single shareholder of our common and preferred shares in the aggregate to 9.8% of the aggregate value of the outstanding common and preferred shares. We call these restrictions the "Ownership Limit." Our Declaration of Trust allows our Board of Trustees to exempt shareholders from the Ownership Limit. The Ownership Limit and the restrictions on ownership of our common shares may delay or prevent a transaction or a change of control that might involve a premium price for our common shares or otherwise be in the best interest of our shareholders.

        Our Declaration of Trust includes other provisions that may prevent or delay a change of control.    Subject to the requirements of the New York Stock Exchange, our Board of Trustees has the authority, without shareholder approval, to issue additional securities on terms that could delay or prevent a change in control. In addition, our Board of Trustees has the authority to reclassify any of our unissued common shares into preferred shares. Our Board of Trustees may issue preferred shares with such preferences, rights, powers and restrictions as our Board of Trustees may determine, which could also delay or prevent a change in control.

        The Maryland business statutes impose potential restrictions that may discourage a change of control of our company.    Various Maryland laws may have the effect of discouraging offers to acquire us, even if the acquisition would be advantageous to shareholders. Resolutions adopted by our Board of Trustees and/or provisions of our bylaws exempt us from such laws, but our Board of Trustees can alter its resolutions or change our bylaws at any time to make these provisions applicable to us.

        Our failure to qualify as a REIT would have adverse tax consequences, which would substantially reduce funds available to make distributions to our shareholders.    We believe that since 1992 we have

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qualified for taxation as a REIT for Federal income tax purposes. We plan to continue to meet the requirements for taxation as a REIT. Many of these requirements, however, are highly technical and complex. The determination that we are a REIT requires an analysis of various factual matters and circumstances that may not be totally within our control. For example, to qualify as a REIT, at least 95% of our gross income must come from certain sources that are specified in the REIT tax laws. We are also required to distribute to shareholders at least 90% of our REIT taxable income (excluding capital gains). The fact that we hold most of our assets through our Operating Partnership and its subsidiaries further complicates the application of the REIT requirements. Even a technical or inadvertent mistake could jeopardize our REIT status. Furthermore, Congress and the Internal Revenue Service might make changes to the tax laws and regulations and the courts might issue new rulings that make it more difficult or impossible for us to remain qualified as a REIT.

        If we fail to qualify as a REIT, we would be subject to Federal income tax at regular corporate rates. Also, unless the Internal Revenue Service granted us relief under certain statutory provisions, we would remain disqualified as a REIT for four years following the year we first fail to qualify. If we fail to qualify as a REIT, we would have to pay significant income taxes and would therefore have less money available for investments or for distributions to our shareholders. In addition, if we fail to qualify as a REIT, we will no longer be required to pay dividends. As a result of all these factors, our failure to qualify as a REIT could impair our ability to expand our business and raise capital and would likely have a significant adverse effect on the value of our securities.

        We could face possible adverse changes in tax laws, which may result in an increase in our tax liability.    From time to time changes in state and local tax laws or regulations are enacted, which may result in an increase in our tax liability. The shortfall in tax revenues for states and municipalities in recent years may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional taxes on our assets or income. These increased tax costs could adversely affect our financial condition and results of operations and the amount of cash available for payment of dividends.

        A number of factors could cause our security prices to decline.    As is the case with any publicly-traded securities, certain factors outside of our control could influence the value of our common and preferred shares. These conditions include, but are not limited to:

    market perception of REITs in general and office REITs in particular;

    the level of institutional investor interest in our Company;

    general economic and business conditions;

    prevailing interest rates;

    our financial performance;

    our underlying asset value;

    market perception of our financial condition, performance, dividends and growth potential; and

    adverse changes in tax laws.

        We may experience significant losses and harm to our financial condition if financial institutions holding our cash and cash equivalents file for bankruptcy protection.    We believe that we maintain our cash and cash equivalents with high quality financial institutions. We have not experienced any losses to date on our deposited cash. However, we may incur significant losses and harm to our financial condition in the future if any of these financial institutions files for bankruptcy protection.

        Certain of our Trustees have potential conflicts of interest.    Certain members of our Board of Trustees own partnership units in our Operating Partnership. These individuals may have personal

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interests that conflict with the interests of our shareholders. For example, if our Operating Partnership sells or refinances certain of the properties that these Trustees contributed to the Operating Partnership, the Trustees could suffer adverse tax consequences. Their personal interests could conflict with our interests if such a sale or refinancing would be advantageous to us. We have certain policies in place that are designed to minimize conflicts of interest. We cannot, however, provide assurance that these policies will be successful in eliminating the influence of such conflicts, and if they are not successful, decisions could be made that might fail to reflect fully the interests of all of our shareholders.

Item 1B.    Unresolved Staff Comments

        None

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Item 2.    Properties

        The following table provides certain information about our wholly owned office properties as of December 31, 2010:

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 

Baltimore/Washington Corridor:

                                   
 

2730 Hercules Road

  BWI Airport     1990     240,336     100.0 % $ 8,087,504   $ 33.65  
   

Annapolis Junction, MD

                                   
 

300 Sentinel Drive

  BWI Airport     2009     192,562     79.5 %   4,883,794     31.90  
   

Annapolis Junction, MD

                                   
 

304 Sentinel Drive

  BWI Airport     2005     162,647     100.0 %   4,900,519     30.13  
   

Annapolis Junction, MD

                                   
 

306 Sentinel Drive

  BWI Airport     2006     155,883     100.0 %   4,741,283     30.42  
   

Annapolis Junction, MD

                                   
 

2720 Technology Drive

  BWI Airport     2004     156,730     100.0 %   5,174,350     33.01  
   

Annapolis Junction, MD

                                   
 

302 Sentinel Drive

  BWI Airport     2007     153,598     99.6 %   5,073,056     33.16  
   

Annapolis Junction, MD

                                   
 

2711 Technology Drive

  BWI Airport     2002     152,196     100.0 %   4,775,664     31.38  
   

Annapolis Junction, MD

                                   
 

308 Sentinel Drive

  BWI Airport     2010     31,128     100.0 %   1,027,224     33.00  
   

Annapolis Junction, MD

                                   
 

320 Sentinel Way

  BWI Airport     2007     125,681     100.0 %   4,808,650     38.26  
   

Annapolis Junction, MD

                                   
 

318 Sentinel Way

  BWI Airport     2005     125,681     100.0 %   4,303,838     34.24  
   

Annapolis Junction, MD

                                   
 

322 Sentinel Way

  BWI Airport     2006     125,568     100.0 %   4,791,402     38.16  
   

Annapolis Junction, MD

                                   
 

324 Sentinel Way

  BWI Airport     2010     125,118     100.0 %   3,543,967     28.32  
   

Annapolis Junction, MD

                                   
 

140 National Business Parkway

  BWI Airport     2003     119,904     100.0 %   4,041,801     33.71  
   

Annapolis Junction, MD

                                   
 

132 National Business Parkway

  BWI Airport     2000     118,598     100.0 %   3,772,677     31.81  
   

Annapolis Junction, MD

                                   
 

2721 Technology Drive

  BWI Airport     2000     118,093     100.0 %   3,863,446     32.72  
   

Annapolis Junction, MD

                                   
 

2701 Technology Drive

  BWI Airport     2001     117,450     100.0 %   3,671,870     31.26  
   

Annapolis Junction, MD

                                   
 

2691 Technology Drive

  BWI Airport     2005     103,683     100.0 %   3,362,821     32.43  
   

Annapolis Junction, MD

                                   
 

134 National Business Parkway

  BWI Airport     1999     93,482     100.0 %   2,716,807     29.06  
   

Annapolis Junction, MD

                                   
 

135 National Business Parkway

  BWI Airport     1998     87,422     89.0 %   2,586,642     33.25  
   

Annapolis Junction, MD

                                   
 

133 National Business Parkway

  BWI Airport     1997     87,401     100.0 %   2,773,921     31.74  
   

Annapolis Junction, MD

                                   
 

141 National Business Parkway

  BWI Airport     1990     87,206     100.0 %   2,831,278     32.47  
   

Annapolis Junction, MD

                                   
 

131 National Business Parkway

  BWI Airport     1990     69,336     100.0 %   2,210,056     31.87  
   

Annapolis Junction, MD

                                   
 

114 National Business Parkway

  BWI Airport     2002     9,908     100.0 %   231,218     23.34  
   

Annapolis Junction, MD

                                   
 

314 Sentinel Way

  BWI Airport     2008     4,462     100.0 %   203,798     45.67  
   

Annapolis Junction, MD

                                   
 

1550 West Nursery Road

  BWI Airport     2009     162,101     100.0 %   3,366,433     20.77  
   

Linthicum, MD

                                   

22


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

1306 Concourse Drive

  BWI Airport     1990     116,307     68.8 %   1,909,479     23.88  
   

Linthicum, MD

                                   
 

1304 Concourse Drive

  BWI Airport     2002     101,792     78.9 %   2,111,806     26.29  
   

Linthicum, MD

                                   
 

900 Elkridge Landing Road

  BWI Airport     1982     100,824     100.0 %   2,372,295     23.53  
   

Linthicum, MD

                                   
 

880 Elkridge Landing Road

  BWI Airport     1981     99,524     100.0 %   2,197,490     22.08  
   

Linthicum, MD

                                   
 

1199 Winterson Road

  BWI Airport     1988     96,636     100.0 %   2,654,571     27.47  
   

Linthicum, MD

                                   
 

920 Elkridge Landing Road

  BWI Airport     1982     96,566     100.0 %   1,942,773     20.12  
   

Linthicum, MD

                                   
 

1302 Concourse Drive

  BWI Airport     1996     84,053     82.3 %   1,741,674     25.17  
   

Linthicum, MD

                                   
 

881 Elkridge Landing Road

  BWI Airport     1986     73,572     100.0 %   1,784,645     24.26  
   

Linthicum, MD

                                   
 

1099 Winterson Road

  BWI Airport     1988     70,583     31.2 %   520,008     23.59  
   

Linthicum, MD

                                   
 

1190 Winterson Road

  BWI Airport     1987     68,899     93.5 %   1,784,960     27.71  
   

Linthicum, MD

                                   
 

849 International Drive

  BWI Airport     1988     68,768     86.3 %   1,579,873     26.62  
   

Linthicum, MD

                                   
 

911 Elkridge Landing Road

  BWI Airport     1985     68,296     100.0 %   1,580,369     23.14  
   

Linthicum, MD

                                   
 

1201 Winterson Road

  BWI Airport     1985     67,903     100.0 %   1,414,097     20.83  
   

Linthicum, MD

                                   
 

999 Corporate Boulevard

  BWI Airport     2000     66,889     91.8 %   1,812,239     29.52  
   

Linthicum, MD

                                   
 

901 Elkridge Landing Road

  BWI Airport     1984     58,035     50.0 %   858,162     29.57  
   

Linthicum, MD

                                   
 

891 Elkridge Landing Road

  BWI Airport     1984     57,955     91.1 %   1,427,742     27.04  
   

Linthicum, MD

                                   
 

800 International Drive

  BWI Airport     1988     57,379     100.0 %   1,199,164     20.90  
   

Linthicum, MD

                                   
 

930 International Drive

  BWI Airport     1986     57,272     99.8 %   1,066,358     18.66  
   

Linthicum, MD

                                   
 

900 International Drive

  BWI Airport     1986     57,140     100.0 %   889,963     15.58  
   

Linthicum, MD

                                   
 

939 Elkridge Landing Road

  BWI Airport     1983     54,280     51.4 %   483,944     17.34  
   

Linthicum, MD

                                   
 

921 Elkridge Landing Road

  BWI Airport     1983     54,175     100.0 %   1,218,938     22.50  
   

Linthicum, MD

                                   
 

938 Elkridge Landing Road

  BWI Airport     1984     52,988     100.0 %   1,244,578     23.49  
   

Linthicum, MD

                                   
 

870 Elkridge Landing Road

  BWI Airport     1981     5,627     100.0 %   190,854     33.92  
   

Linthicum, MD

                                   
 

7467 Ridge Road

  BWI Airport     1990     74,136     83.1 %   1,436,000     23.31  
   

Hanover, MD

                                   
 

7240 Parkway Drive

  BWI Airport     1985     74,153     79.9 %   1,278,782     21.58  
   

Hanover, MD

                                   
 

7272 Park Circle Drive

  BWI Airport     1991/1996     59,888     79.6 %   999,610     20.97  
   

Hanover, MD

                                   
 

7318 Parkway Drive

  BWI Airport     1984     59,204     100.0 %   1,200,508     20.28  
   

Hanover, MD

                                   
 

7320 Parkway Drive

  BWI Airport     1983     56,964     0.0 %        
   

Hanover, MD

                                   

23


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

1340 Ashton Road

  BWI Airport     1989     45,867     100.0 %   934,899     20.38  
   

Hanover, MD

                                   
 

1362 Mellon Road

  BWI Airport     2006     43,232     58.6 %   572,879     22.61  
   

Hanover, MD

                                   
 

1334 Ashton Road

  BWI Airport     1989     37,317     100.0 %   870,824     23.34  
   

Hanover, MD

                                   
 

1331 Ashton Road

  BWI Airport     1989     28,998     29.5 %   144,125     16.84  
   

Hanover, MD

                                   
 

1350 Dorsey Road

  BWI Airport     1989     18,698     67.2 %   268,575     21.38  
   

Hanover, MD

                                   
 

1344 Ashton Road

  BWI Airport     1989     16,964     100.0 %   499,521     29.45  
   

Hanover, MD

                                   
 

1341 Ashton Road

  BWI Airport     1989     15,947     100.0 %   318,390     19.97  
   

Hanover, MD

                                   
 

1343 Ashton Road

  BWI Airport     1989     9,903     100.0 %   135,968     13.73  
   

Hanover, MD

                                   
 

1348 Ashton Road

  BWI Airport     1988     3,108     100.0 %   75,930     24.43  
   

Hanover, MD

                                   
 

5520 Research Park Drive

  BWI Airport     2009     103,990     39.2 %   1,034,972     25.37  
   

Catonsville, MD

                                   
 

5522 Research Park Drive

  BWI Airport     2007     23,500     100.0 %   781,887     33.27  
   

Catonsville, MD

                                   
 

2500 Riva Road

  Annapolis     2000     155,000     100.0 %   2,217,712     14.31  
   

Annapolis, MD

                                   
 

Old Annapolis Road

  Howard County     1974/1985     171,436     100.0 %   7,320,399     42.70  
   

Columbia, MD

  Perimeter                                
 

7125 Columbia Gateway Drive

  Howard County     1973/1999     470,249     63.8 %   5,860,672     19.54  
   

Columbia, MD

  Perimeter                                
 

7000 Columbia Gateway Drive

  Howard County     1999     145,806     76.9 %   1,975,915     17.63  
   

Columbia, MD

  Perimeter                                
 

6721 Columbia Gateway Drive

  Howard County     2009     131,451     100.0 %   3,781,845     28.77  
   

Columbia, MD

  Perimeter                                
 

6731 Columbia Gateway Drive

  Howard County     2002     123,847     89.2 %   3,211,304     29.07  
   

Columbia, MD

  Perimeter                                
 

6711 Columbia Gateway Drive

  Howard County     2006-2007     123,599     93.2 %   3,400,641     29.53  
   

Columbia, MD

  Perimeter                                
 

6940 Columbia Gateway Drive

  Howard County     1999     108,822     86.2 %   2,405,306     25.64  
   

Columbia, MD

  Perimeter                                
 

6950 Columbia Gateway Drive

  Howard County     1998     112,861     100.0 %   2,631,046     23.31  
   

Columbia, MD

  Perimeter                                
 

7067 Columbia Gateway Drive

  Howard County     2001     86,027     92.4 %   1,842,907     23.17  
   

Columbia, MD

  Perimeter                                
 

8621 Robert Fulton Drive

  Howard County     2005-2006     86,033     94.2 %   1,734,169     21.40  
   

Columbia, MD

  Perimeter                                
 

6750 Alexander Bell Drive

  Howard County     2001     75,328     86.8 %   1,717,494     26.27  
   

Columbia, MD

  Perimeter                                
 

6700 Alexander Bell Drive

  Howard County     1988     76,347     77.0 %   1,444,917     24.59  
   

Columbia, MD

  Perimeter                                
 

6740 Alexander Bell Drive

  Howard County     1992     63,480     100.0 %   1,813,601     28.57  
   

Columbia, MD

  Perimeter                                
 

7015 Albert Einstein Drive

  Howard County     1999     61,203     100.0 %   1,293,310     21.13  
   

Columbia, MD

  Perimeter                                
 

8671 Robert Fulton Drive

  Howard County     2002     56,350     100.0 %   1,051,310     18.66  
   

Columbia, MD

  Perimeter                                
 

6716 Alexander Bell Drive

  Howard County     1990     52,131     90.6 %   1,100,117     23.29  
   

Columbia, MD

  Perimeter                                

24


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

8661 Robert Fulton Drive

  Howard County     2002     49,307     100.0 %   938,964     19.04  
   

Columbia, MD

  Perimeter                                
 

7142 Columbia Gateway Drive

  Howard County     1994     47,668     100.0 %   716,005     15.02  
   

Columbia, MD

  Perimeter                                
 

7130 Columbia Gateway Drive

  Howard County     1989     46,460     100.0 %   883,181     19.01  
   

Columbia, MD

  Perimeter                                
 

6708 Alexander Bell Drive

  Howard County     1988     39,203     100.0 %   916,824     23.39  
   

Columbia, MD

  Perimeter                                
 

7065 Columbia Gateway Drive

  Howard County     2000     38,560     100.0 %   774,928     20.10  
   

Columbia, MD

  Perimeter                                
 

7138 Columbia Gateway Drive

  Howard County     1990     38,225     100.0 %   863,790     22.60  
   

Columbia, MD

  Perimeter                                
 

7063 Columbia Gateway Drive

  Howard County     2000     36,472     100.0 %   958,645     26.28  
   

Columbia, MD

  Perimeter                                
 

6760 Alexander Bell Drive

  Howard County     1991     36,225     57.8 %   477,243     22.79  
   

Columbia, MD

  Perimeter                                
 

7150 Columbia Gateway Drive

  Howard County     1991     35,812     84.6 %   572,576     18.89  
   

Columbia, MD

  Perimeter                                
 

7061 Columbia Gateway Drive

  Howard County     2000     29,910     83.0 %   586,231     23.62  
   

Columbia, MD

  Perimeter                                
 

6724 Alexander Bell Drive

  Howard County     2001     28,107     94.6 %   707,435     26.60  
   

Columbia, MD

  Perimeter                                
 

7134 Columbia Gateway Drive

  Howard County     1990     21,991     0.0 %        
   

Columbia, MD

  Perimeter                                
 

6741 Columbia Gateway Drive

  Howard County     2008     4,592     100.0 %   123,984     27.00  
   

Columbia, MD

  Perimeter                                
 

7200 Riverwood Drive

  Howard County     1986     160,000     100.0 %   4,400,776     27.50  
   

Columbia, MD

  Perimeter                                
 

7160 Riverwood Drive

  Howard County     2000     61,984     94.6 %   1,718,771     29.32  
   

Columbia, MD

  Perimeter                                
 

9140 Guilford Road

  Howard County     1983     40,286     53.3 %   385,654     17.95  
   

Columbia, MD

  Perimeter                                
 

7150 Riverwood Drive

  Howard County     2000     39,496     100.0 %   780,997     19.77  
   

Columbia, MD

  Perimeter                                
 

9160 Guilford Road

  Howard County     1984     37,034     100.0 %   948,186     25.60  
   

Columbia, MD

  Perimeter                                
 

7170 Riverwood Drive

  Howard County     2000     29,162     65.3 %   359,160     18.87  
   

Columbia, MD

  Perimeter                                
 

9150 Guilford Drive

  Howard County     1984     18,592     100.0 %   366,640     19.72  
   

Columbia, MD

  Perimeter                                
 

10280 Old Columbia Road

  Howard County     1988/2001     16,195     90.5 %   247,579     16.89  
   

Columbia, MD

  Perimeter                                
 

10270 Old Columbia Road

  Howard County     1988/2001     15,910     100.0 %   237,242     14.91  
   

Columbia, MD

  Perimeter                                
 

9130 Guilford Drive

  Howard County     1984     13,700     0.0 %        
   

Columbia, MD

  Perimeter                                
 

10290 Old Columbia Road

  Howard County     1988/2001     10,263     43.9 %   96,897     21.50  
   

Columbia, MD

  Perimeter                                
 

9720 Patuxent Woods Drive

  Howard County     1986/2001     40,004     12.4 %   47,145     9.51  
   

Columbia, MD

  Perimeter                                
 

9740 Patuxent Woods Drive

  Howard County     1986/2001     38,292     100.0 %   567,968     14.83  
   

Columbia, MD

  Perimeter                                
 

9700 Patuxent Woods Drive

  Howard County     1986/2001     31,220     84.2 %   569,376     21.65  
   

Columbia, MD

  Perimeter                                
 

9730 Patuxent Woods Drive

  Howard County     1986/2001     30,485     100.0 %   482,386     15.82  
   

Columbia, MD

  Perimeter                                

25


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

9710 Patuxent Woods Drive

  Howard County     1986/2001     14,778     72.2 %   131,309     12.30  
   

Columbia, MD

  Perimeter                                
 

9020 Mendenhall Court

  Howard County     1982/2005     49,217     88.6 %   651,297     14.94  
   

Columbia, MD

  Perimeter                                

                               
 

Subtotal/Average

              8,432,626     89.5 % $ 201,596,725   $ 26.72  

                               

Northern Virginia:

                                   
 

15000 Conference Center Drive

  Dulles South     1989     471,440     80.4 % $ 9,261,749   $ 24.44  
   

Chantilly, VA

                                   
 

15010 Conference Center Drive

  Dulles South     2006     223,610     100.0 %   6,957,290     31.11  
   

Chantilly, VA

                                   
 

15059 Conference Center Drive

  Dulles South     2000     145,224     98.8 %   4,532,214     31.60  
   

Chantilly, VA

                                   
 

15049 Conference Center Drive

  Dulles South     1997     145,706     99.8 %   4,792,103     32.97  
   

Chantilly, VA

                                   
 

14900 Conference Center Drive

  Dulles South     1999     126,158     76.9 %   2,777,767     28.62  
   

Chantilly, VA

                                   
 

14280 Park Meadow Drive

  Dulles South     1999     114,126     88.3 %   2,701,138     26.80  
   

Chantilly, VA

                                   
 

4851 Stonecroft Boulevard

  Dulles South     2004     88,094     100.0 %   2,604,401     29.56  
   

Chantilly, VA

                                   
 

14850 Conference Center Drive

  Dulles South     2000     72,194     33.4 %   334,537     13.89  
   

Chantilly, VA

                                   
 

14840 Conference Center Drive

  Dulles South     2000     69,710     100.0 %   2,135,089     30.63  
   

Chantilly, VA

                                   
 

13200 Woodland Park Drive

  Herndon     2002     404,665     100.0 %   12,289,923     30.37  
   

Herndon, VA

                                   
 

13454 Sunrise Valley Road

  Herndon     1998     111,816     75.0 %   2,206,231     26.30  
   

Herndon, VA

                                   
 

13450 Sunrise Valley Road

  Herndon     1998     53,776     98.5 %   1,418,577     26.78  
   

Herndon, VA

                                   
 

3120 Fairview Park Drive(4)

  Herndon     2008     7,080     100.0 %   281,705     39.79  
   

Herndon, VA

                                   
 

1751 Pinnacle Drive

  Tysons Corner     1989/1995     260,469     95.6 %   8,688,804     34.88  
   

McLean, VA

                                   
 

1753 Pinnacle Drive

  Tysons Corner     1976/2004     186,707     100.0 %   6,752,584     36.17  
   

McLean, VA

                                   
 

1550 Westbranch Drive

  Tysons Corner     2002     152,240     100.0 %   4,883,163     32.08  
   

McLean, VA

                                   
 

2900 Towerview Road

  Herndon     1982/2008     139,802     100.0 %   2,339,361     16.73  
   

Herndon, VA

                                   

                               
 

Subtotal/Average

              2,772,817     91.9 % $ 74,956,636   $ 29.41  

                               

Suburban Maryland:

                                   
 

11800 Tech Road

  North Silver Spring     1969/1989     228,179     82.6 % $ 3,314,427   $ 17.60  
   

Silver Spring, MD

                                   
 

400 Professional Drive

  Gaithersburg     2000     129,355     61.2 %   2,245,727     28.37  
   

Gaithersburg, MD

                                   
 

110 Thomas Johnson Drive

  Frederick     1987/1999     122,490     100.0 %   2,912,166     23.77  
   

Frederick, MD

                                   
 

45 West Gude Drive

  Rockville     1987     108,588     0.0 %        
   

Rockville, MD

                                   
 

15 West Gude Drive

  Rockville     1986     106,694     100.0 %   2,680,626     25.12  
   

Rockville, MD

                                   

                               
 

Subtotal/Average

              695,306     71.4 % $ 11,152,946   $ 22.45  

                               

26


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 

Washington, DC—Capitol Riverfront:

                                   
 

1201 M Street

  Washington, DC—     2001     200,509     99.8 % $ 8,917,050   $ 44.58  
   

Washington, DC

  Capitol Riverfront                                
 

1220 M Street

  Washington, DC—     2003     161,165     97.0 %   6,804,065     43.54  
   

Washington, DC

  Capitol Riverfront                                

                               
 

Subtotal/Average

              361,674     98.5 % $ 15,721,115   $ 44.13  

                               

St. Mary's & King George Counties:

                                   
 

22309 Exploration Drive

  St. Mary's County     1984/1997     98,860     100.0 % $ 1,489,935   $ 15.07  
   

Lexington Park, MD

                                   
 

22289 Exploration Drive

  St. Mary's County     2000     58,676     100.0 %   1,293,086     22.04  
   

Lexington Park, MD

                                   
 

22299 Exploration Drive

  St. Mary's County     1998     58,363     93.9 %   1,272,775     23.24  
   

Lexington Park, MD

                                   
 

22300 Exploration Drive

  St. Mary's County     1997     44,830     100.0 %   740,600     16.52  
   

Lexington Park, MD

                                   
 

46579 Expedition Drive

  St. Mary's County     2002     61,156     100.0 %   1,393,131     22.78  
   

Lexington Park, MD

                                   
 

46591 Expedition Drive

  St. Mary's County     2005-2006     59,483     100.0 %   1,367,515     22.99  
   

Lexington Park, MD

                                   
 

44425 Pecan Court

  St. Mary's County     1997     58,981     94.2 %   1,131,964     20.38  
   

California, MD

                                   
 

44408 Pecan Court

  St. Mary's County     1986     50,532     0.0 %        
   

California, MD

                                   
 

23535 Cottonwood Parkway

  St. Mary's County     1984     46,656     100.0 %   576,202     12.35  
   

California, MD

                                   
 

44417 Pecan Court

  St. Mary's County     1989     29,053     100.0 %   304,771     10.49  
   

California, MD

                                   
 

44414 Pecan Court

  St. Mary's County     1986     25,444     100.0 %   258,390     10.16  
   

California, MD

                                   
 

44420 Pecan Court

  St. Mary's County     1989     25,200     0.0 %        
   

California, MD

                                   
 

16480 Commerce Drive

  King George County     2000     70,728     100.0 %   1,296,725     18.33  
   

Dahlgren, VA

                                   
 

16541 Commerce Drive

  King George County     1996     36,053     100.0 %   688,662     19.10  
   

King George, VA

                                   
 

16539 Commerce Drive

  King George County     1990     32,076     100.0 %   585,387     18.25  
   

King George, VA

                                   
 

16442 Commerce Drive

  King George County     2002     25,518     0.0 %        
   

Dahlgren, VA

                                   
 

16501 Commerce Drive

  King George County     2002     22,833     100.0 %   482,256     21.12  
   

Dahlgren, VA

                                   
 

16543 Commerce Drive

  King George County     2002     17,370     100.0 %   416,428     23.97  
   

Dahlgren, VA

                                   

                               
 

Subtotal/Average

              821,812     86.8 % $ 13,297,827   $ 18.64  

                               

Greater Baltimore:

                                   
 

11311 McCormick Road

  Hunt Valley/Rte 83     1984/1994     214,704     93.5 % $ 4,643,709   $ 23.14  
   

Hunt Valley, MD

  Corridor                                
 

200 International Circle

  Hunt Valley/Rte 83     1987     125,352     97.1 %   2,690,307     22.11  
   

Hunt Valley, MD

  Corridor                                
 

226 Schilling Circle

  Hunt Valley/Rte 83     1980     97,309     100.0 %   2,401,352     24.68  
   

Hunt Valley, MD

  Corridor                                
 

201 International Circle

  Hunt Valley/Rte 83     1982     78,243     84.1 %   1,536,019     23.35  
   

Hunt Valley, MD

  Corridor                                

27


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

11011 McCormick Road

  Hunt Valley/Rte 83     1974     57,104     24.9 %   269,571     18.96  
   

Hunt Valley, MD

  Corridor                                
 

216 Schilling Circle

  Hunt Valley/Rte 83     1988/2001     35,806     91.8 %   722,790     21.99  
   

Hunt Valley, MD

  Corridor                                
 

222 Schilling Circle

  Hunt Valley/Rte 83     1978/1997     28,618     63.5 %   354,738     19.52  
   

Hunt Valley, MD

  Corridor                                
 

224 Schilling Circle

  Hunt Valley/Rte 83     1978/1997     27,575     79.2 %   421,454     19.31  
   

Hunt Valley, MD

  Corridor                                
 

10150 York Road

  Hunt Valley/Rte 83     1985     174,737     77.1 %   2,534,548     18.81  
   

Hunt Valley, MD

  Corridor                                
 

9690 Deereco Road

  Hunt Valley/Rte 83     1988     133,861     85.5 %   2,934,096     25.64  
   

Timonium, MD

  Corridor                                
 

375 W. Padonia Road

  Hunt Valley/Rte 83     1986     104,885     99.6 %   2,000,112     19.14  
   

Timonium, MD

  Corridor                                
 

7210 Ambassador Road

  Baltimore County     1972     83,435     100.0 %   795,136     9.53  
   

Woodlawn, MD

  Westside                                
 

7152 Windsor Boulevard

  Baltimore County     1986     57,855     100.0 %   969,876     16.76  
   

Woodlawn, MD

  Westside                                
 

21 Governor's Court

  Baltimore County     1981/1995     56,383     70.9 %   634,002     15.86  
   

Woodlawn, MD

  Westside                                
 

7125 Ambassador Road

  Baltimore County     1985     50,604     84.9 %   866,651     20.17  
   

Woodlawn, MD

  Westside                                
 

7104 Ambassador Road

  Baltimore County     1988     30,081     100.0 %   595,662     19.80  
   

Woodlawn, MD

  Westside                                
 

17 Governor's Court

  Baltimore County     1981     14,454     79.2 %   213,845     18.67  
   

Woodlawn, MD

  Westside                                
 

15 Governor's Court

  Baltimore County     1981     14,568     100.0 %   241,902     16.61  
   

Woodlawn, MD

  Westside                                
 

7127 Ambassador Road

  Baltimore County     1985     11,630     62.2 %   150,161     20.75  
   

Woodlawn, MD

  Westside                                
 

7129 Ambassador Road

  Baltimore County     1985     11,075     100.0 %   81,844     7.39  
   

Woodlawn, MD

  Westside                                
 

7108 Ambassador Road

  Baltimore County     1988     8,811     100.0 %   160,039     18.16  
   

Woodlawn, MD

  Westside                                
 

7102 Ambassador Road

  Baltimore County     1988     8,879     100.0 %   149,003     16.78  
   

Woodlawn, MD

  Westside                                
 

7106 Ambassador Road

  Baltimore County     1988     8,899     100.0 %   137,073     15.40  
   

Woodlawn, MD

  Westside                                
 

7131 Ambassador Road

  Baltimore County     1985     7,734     44.2 %   33,844     9.89  
   

Woodlawn, MD

  Westside                                
 

502 Washington Avenue

  Towson     1984     90,435     77.5 %   1,353,535     19.32  
   

Towson, MD

                                   
 

102 West Pennsylvania Avenue

  Towson     1968/2001     49,701     84.9 %   902,784     21.41  
   

Towson, MD

                                   
 

100 West Pennsylvania Avenue

  Towson     1952/1989     20,099     71.7 %   253,146     17.56  
   

Towson, MD

                                   
 

109-111 Allegheny Avenue

  Towson     1971     18,431     100.0 %   302,127     16.39  
   

Towson, MD

                                   
 

1501 South Clinton Street

  Baltimore     2006     474,637     89.82 %   14,963,100     35.10  
   

Baltimore, MD

                                   
 

209 Research Boulevard

  Harford County     2010     47,930     100.00 %   1,360,410     28.38  
   

Aberdeen, MD

                                   
 

210 Research Boulevard

  Harford County     2010     27,551     100.00 %   817,292     29.66  
   

Aberdeen, MD

                                   
 

4940 Campbell Boulevard

  White Marsh     1990     50,415     82.1 %   947,788     22.91  
   

White Marsh, MD

                                   

28


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

8140 Corporate Drive

  White Marsh     2003     76,271     77.0 %   1,618,164     27.54  
   

White Marsh, MD

                                   
 

8110 Corporate Drive

  White Marsh     2001     79,091     95.7 %   1,772,798     23.42  
   

White Marsh, MD

                                   
 

9910 Franklin Square Drive

  White Marsh     2005     57,812     97.3 %   1,275,032     22.66  
   

White Marsh, MD

                                   
 

9920 Franklin Square Drive

  White Marsh     2006     42,891     88.2 %   853,392     22.56  
   

White Marsh, MD

                                   
 

9930 Franklin Square Drive

  White Marsh     2001     39,750     100.0 %   912,035     22.94  
   

White Marsh, MD

                                   
 

9900 Franklin Square Drive

  White Marsh     1999     33,800     100.0 %   580,001     17.16  
   

White Marsh, MD

                                   
 

9940 Franklin Square Drive

  White Marsh     2000     32,242     100.0 %   635,808     19.72  
   

White Marsh, MD

                                   
 

8020 Corporate Drive

  White Marsh     1997     50,796     100.0 %   928,800     18.28  
   

White Marsh, MD

                                   
 

8094 Sandpiper Circle

  White Marsh     1998     49,585     88.7 %   815,265     18.53  
   

White Marsh, MD

                                   
 

8098 Sandpiper Circle

  White Marsh     1998     46,485     100.0 %   850,882     18.30  
   

White Marsh, MD

                                   
 

8010 Corporate Drive

  White Marsh     1998     38,487     92.5 %   664,111     18.65  
   

White Marsh, MD

                                   
 

5355 Nottingham Ridge Road

  White Marsh     2005     35,930     79.58 %   475,646     16.63  
   

White Marsh, MD

                                   
 

5325 Nottingham Ridge Road

  White Marsh     2002     35,678     76.3 %   589,576     21.65  
   

White Marsh, MD

                                   
 

7941-7949 Corporate Drive

  White Marsh     1996     57,782     0.0 %        
   

White Marsh, MD

                                   
 

8007 Corporate Drive

  White Marsh     1995     41,799     84.8 %   634,373     17.89  
   

White Marsh, MD

                                   
 

8019 Corporate Drive

  White Marsh     1990     32,423     75.9 %   508,682     20.67  
   

White Marsh, MD

                                   
 

8013 Corporate Drive

  White Marsh     1990     29,995     27.6 %   131,969     15.94  
   

White Marsh, MD

                                   
 

8003 Corporate Drive

  White Marsh     1999     17,599     43.1 %   182,921     24.11  
   

White Marsh, MD

                                   
 

8015 Corporate Drive

  White Marsh     1990     15,669     87.1 %   279,185     20.45  
   

White Marsh, MD

                                   
 

8023 Corporate Drive

  White Marsh     1990     9,486     100.0 %   182,736     19.26  
   

White Marsh, MD

                                   
 

5020 Campbell Boulevard

  White Marsh     1986-1988     43,623     65.2 %   444,271     15.63  
   

White Marsh, MD

                                   
 

5024 Campbell Boulevard

  White Marsh     1986-1988     33,710     60.2 %   344,830     16.98  
   

White Marsh, MD

                                   
 

5026 Campbell Boulevard

  White Marsh     1986-1988     30,163     77.8 %   365,325     15.57  
   

White Marsh, MD

                                   
 

5022 Campbell Boulevard

  White Marsh     1986-1988     26,748     74.7 %   348,054     17.42  
   

White Marsh, MD

                                   
 

10001 Franklin Square Drive

  White Marsh     1997     218,215     100.0 %   1,127,298     5.17  
   

White Marsh, MD

                                   
 

8114 Sandpiper Circle

  White Marsh     1986     45,806     75.8 %   892,640     25.70  
   

White Marsh, MD

                                   
 

4979 Mercantile Road

  White Marsh     1985     51,198     100.0 %   753,911     14.73  
   

White Marsh, MD

                                   
 

4969 Mercantile Road

  White Marsh     1983     47,132     0.0 %        
   

White Marsh, MD

                                   

29


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

7939 Honeygo Boulevard

  White Marsh     1984     28,208     81.7 %   517,254     22.45  
   

White Marsh, MD

                                   
 

8133 Perry Hall Boulevard

  White Marsh     1988     27,996     90.2 %   524,990     20.80  
   

White Marsh, MD

                                   
 

7923 Honeygo Boulevard

  White Marsh     1985     23,481     61.4 %   293,652     20.36  
   

White Marsh, MD

                                   
 

8031 Corporate Drive

  White Marsh     1988/2004     66,000     100.0 %   1,238,328     18.76  
   

White Marsh, MD

                                   
 

8615 Ridgely's Choice Drive

  White Marsh     2005     37,746     58.4 %   466,258     21.16  
   

White Marsh, MD

                                   
 

8029 Corporate Drive

  White Marsh     1988/2004     25,000     100.0 %   476,524     19.06  
   

White Marsh, MD

                                   

                               
 

Subtotal/Average

              3,750,398     85.0 % $ 68,122,627   $ 21.38  

                               

Colorado Springs:

                                   
 

655 Space Center Drive

  Colorado Springs     2008     103,970     100.0 % $ 2,135,769   $ 20.54  
   

Colorado Springs, CO

  East                                
 

985 Space Center Drive

  Colorado Springs     1989     104,028     78.0 %   1,824,943     22.50  
   

Colorado Springs, CO

  East                                
 

565 Space Center Drive

  Colorado Springs     2009     89,899     2.2 %   36,345     18.63  
   

Colorado Springs, CO

  East                                
 

745 Space Center Drive

  Colorado Springs     2006     51,500     100.0 %   1,359,311     26.39  
   

Colorado Springs, CO

  East                                
 

980 Technology Court

  Colorado Springs     1995     33,207     99.9 %   645,475     19.45  
   

Colorado Springs, CO

  East                                
 

525 Babcock Road

  Colorado Springs     1967     14,000     100.0 %   191,559     13.68  
   

Colorado Springs, CO

  East                                
 

1055 North Newport Road

  Colorado Springs     2007-2008     59,763     100.0 %   1,190,948     19.93  
   

Colorado Springs, CO

  East                                
 

3535 Northrop Grumman Point

  Colorado Springs     2008     124,305     100.0 %   2,341,806     18.84  
   

Colorado Springs, CO

  East                                
 

1670 North Newport Road

  Colorado Springs     1986-1987     67,500     56.2 %   795,514     20.97  
   

Colorado Springs, CO

  East                                
 

1915 Aerotech Drive

  Colorado Springs     1985     37,946     34.5 %   238,837     18.26  
   

Colorado Springs, CO

  East                                
 

1925 Aerotech Drive

  Colorado Springs     1985     37,946     60.1 %   494,422     21.67  
   

Colorado Springs, CO

  East                                
 

10807 New Allegiance Drive

  I-25 North Corridor     2009     145,723     41.2 %   1,353,816     22.57  
   

Colorado Springs, CO

                                   
 

12515 Academy Ridge View

  I-25 North Corridor     2006     61,372     100.0 %   1,435,164     23.38  
   

Colorado Springs, CO

                                   
 

9965 Federal Drive

  I-25 North Corridor     1983/2007     74,749     100.0 %   1,233,813     16.51  
   

Colorado Springs, CO

                                   
 

9945 Federal Drive

  I-25 North Corridor     2009     74,005     0.0 %        
   

Colorado Springs, CO

                                   
 

9950 Federal Drive

  I-25 North Corridor     2001     66,223     100.0 %   1,048,213     15.83  
   

Colorado Springs, CO

                                   
 

9925 Federal Drive

  I-25 North Corridor     2008     53,788     81.3 %   697,407     15.95  
   

Colorado Springs, CO

                                   
 

9960 Federal Drive

  I-25 North Corridor     2001     46,948     78.3 %   803,174     21.84  
   

Colorado Springs, CO

                                   
 

5775 Mark Dabling Boulevard

  Colorado Springs     1984     109,678     100.0 %   1,882,027     17.16  
   

Colorado Springs, CO

  Northwest                                
 

5725 Mark Dabling Boulevard

  Colorado Springs     1984     108,976     100.0 %   2,079,346     19.08  
   

Colorado Springs, CO

  Northwest                                

30


Table of Contents

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 
 

5755 Mark Dabling Boulevard

  Colorado Springs     1989     103,400     87.2 %   2,033,358     22.56  
   

Colorado Springs, CO

  Northwest                                

                               
 

Subtotal/Average

              1,568,926     76.2 % $ 23,821,247   $ 19.93  

                               

San Antonio, Texas:

                                   
 

7700 Potranco Road

  San Antonio     1982/1985     508,412     100.0 % $ 16,451,125   $ 32.36  
   

San Antonio, TX

  Northwest                                
 

8000 Potranco Road

  San Antonio     2010     125,005     100.0 %   3,218,879     25.75  
   

San Antonio, TX

  Northwest                                
 

8030 Potranco Road

  San Antonio     2010     125,005     100.0 %   3,218,879     25.75  
   

San Antonio, TX

  Northwest                                
 

7700-5 Potranco Road

  San Antonio     2009     25,056     100.0 %   355,632     14.19  
   

San Antonio, TX

  Northwest                                
 

7700-1 Potranco Road

  San Antonio     2007     8,674     100.0 %   289,539     33.38  
   

San Antonio, TX

  Northwest                                
 

1560 A Cable Ranch Road

  San Antonio     1985/2007     45,935     100.0 %   581,182     12.65  
   

San Antonio, TX

  Northwest                                
 

1560 B Cable Ranch Road

  San Antonio     1985/2006     77,040     100.0 %   1,801,365     23.38  
   

San Antonio, TX

  Northwest                                

                               
 

Subtotal/Average

              915,127     100.0 % $ 25,916,601   $ 28.32  

                               

Greater Philadelphia, Pennsylvania:

                                   
 

785 Jolly Road

  Blue Bell     1996     219,065     100.0 % $ 2,783,362   $ 11.94  
   

Blue Bell, PA

                                   
 

801 Lakeview Drive

  Blue Bell     1994     156,695     100.0 %   4,142,959     17.18  
   

Blue Bell, PA

                                   

                               
 

Subtotal/Average

              375,760     100.0 % $ 6,926,321   $ 18.43  

                               

Other:

                                   
 

11751 Meadowville Lane

  Richmond Southwest     2007     193,000     100.0 % $ 5,639,518   $ 29.22  
   

Chester, VA

                                   
 

201 Technology Park Drive

  Southwest Virginia     2007     102,842     100.0 %   3,416,773     33.22  
   

Lebanon, VA

                                   

                               
 

Subtotal/Average

              295,842     100.0 % $ 9,056,291   $ 30.61  

                               
 

Total/Average

             
19,990,288
   
88.2

%

$

450,568,336
 
$

25.56
 

                               

(1)
This percentage is based upon all rentable square feet under lease terms that were in effect as of December 31, 2010.

(2)
Annualized rental revenue is the monthly contractual base rent as of December 31, 2010 multiplied by 12, plus the estimated annualized expense reimbursements under existing leases. We consider annualized rental revenue to be a useful measure for analyzing revenue sources because, since it is point-in-time based, it does not contain increases and decreases in revenue associated with periods in which lease terms were not in effect; historical revenue under GAAP does contain such fluctuations. We find the measure particularly useful for leasing, tenant, segment and industry analysis.

(3)
Annualized rental revenue per occupied square foot is a property's annualized rental revenue divided by that property's occupied square feet as of December 31, 2010.

(4)
This property, which was shell complete in 2008 and acquired by us in December 2010, contains a total 183,440 square feet. For accounting purposes, this space was 100% operational upon acquisition. For occupancy reporting, we are not including the unoccupied portion of the property in rentable square feet until the earlier of when leases commence on the space or one year from the date of acquisition.

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Table of Contents

        The following table provides certain information about our wholly owned office properties that were under construction, development or redevelopment as of December 31, 2010:

Property and Location
  Submarket   Estimated
Rentable
Square Feet
Upon Completion
  Percentage
Leased at
December 31,
2010
 

Under Construction

                 

Baltimore/Washington Corridor:

                 
 

316 Sentinel Way

  BWI Airport     125,044     0 %
   

Annapolis Junction, MD

                 
 

7205 Riverwood Road

  Howard Co. Perimeter     86,000     0 %
   

Columbia, MD

                 
 

308 Sentinel Drive(1)

  BWI Airport     151,543     98 %
   

Annapolis Junction, MD

                 
 

410 National Business Parkway

  BWI Airport     110,000     0 %
   

Annapolis Junction, MD

                 
 

430 National Business Parkway

  BWI Airport     109,341     0 %
   

Annapolis Junction, MD

                 
                 
 

Subtotal/Average

        581,928        
                 

St. Mary's & King George Counties:

                 
 

45310 Abell House Lane

  St. Mary's County     80,205     100 %
   

California, MD

                 
                 

Greater Baltimore:

                 
 

206 Research Boulevard

  Harford County     127,300     0 %
   

Aberdeen, MD

                 
 

209 Research Boulevard(1)

  Harford County     77,192     100 %
   

Aberdeen, MD

                 
 

210 Research Boulevard(1)

  Harford County     79,573     35 %
   

Aberdeen, MD

                 
                 
 

Subtotal/Average

        284,065        
                 

San Antonio:

                 
 

100 Sentry Gateway

  San Antonio Northwest     94,550     0 %
   

San Antonio, TX

                 
                 
 

Total Under Construction

        1,040,748     32 %
                 

Under Development

                 

Baltimore/Washington Corridor:

                 
 

310 Sentinel Way

  BWI Airport     240,000     N/A  
   

Annapolis Junction, MD

                 
 

312 Sentinel Way

  BWI Airport     125,000     N/A  
   

Annapolis Junction, MD

                 
 

420 National Business Parkway

  BWI Airport     140,000     N/A  
   

Annapolis Junction, MD

                 
                 
 

Subtotal/Average

        505,000        
                 

32


Table of Contents

Property and Location
  Submarket   Estimated
Rentable
Square Feet
Upon Completion
  Percentage
Leased at
December 31,
2010
 

Northern Virginia:

                 
 

7770 Backlick Road

  Springfield     240,000     N/A  
   

Springfield, VA

                 
                 

Greater Baltimore:

                 
 

202 Research Boulevard

  Harford County     127,530     N/A  
   

Aberdeen, MD

                 
                 

San Antonio:

                 
 

Sentry Gateway

  San Antonio Northwest     93,830     N/A  
   

San Antonio, TX

                 
 

8100 Portanco Road

  San Antonio Northwest     125,000     N/A  
   

San Antonio, TX

                 
                 
 

Subtotal/Average

        218,830        
                 
 

Total Under Development

        1,091,360        
                 

Under Redevelopment

                 

Baltimore/Washington Corridor:

                 
 

7468 Candlewood Road

  BWI Airport     357,700     0 %
 

Hanover, MD

                 
                 

Northern Virginia:

                 
 

3120 Fairview Park Drive(2)

  Herndon     183,440     4 %
   

Herndon, VA

                 
                 

Greater Philadelphia:

                 
 

801 Lakeview Drive(1)

  Greater Philadelphia     218,653     72 %
   

Blue Bell, PA

                 
 

751 Arbor Way

  Greater Philadelphia     113,500     0 %
   

Blue Bell, PA

                 
                 
 

Subtotal/Average

        332,153        
                 
 

Total Under Redevelopment

        873,293        
                 

(1)
Estimated rentable square feet includes space reported as rentable square feet on the previous table of wholly owned operating office properties attributable to partially operational properties.

(2)
This property, which was shell complete in 2008, was acquired by us in December 2010. For accounting purposes, this space was 100% operational upon acquisition. For occupancy reporting, we are including the space as "Under Redevelopment" until the earlier of when leases commence on the space or one year from the date of acquisition. Estimated rentable square feet for this property includes 7,080 rentable square feet reported on the previous table of wholly owned operating office properties attributable to the occupied portion of the property.

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Table of Contents

        The following table provides certain information about our wholly owned developable land holdings not under construction or development as of December 31, 2010, including properties under ground lease to us:

Land Location
  Submarket   Acres   Estimated
Developable
Square
Feet
 

Baltimore/Washington Corridor:

                 
 

National Business Park North

  BWI Airport     162     1,111,000  
   

Annapolis Junction, MD

                 
 

1243 Winterson Road (AS 22)

  BWI Airport     2     30,000  
   

Linthicum, MD

                 
 

940 Elkridge Landing Road (AS7)

  BWI Airport     3     54,000  
   

Linthicum, MD

                 
 

West Nursery Road

  BWI Airport     1     5,000  
   

Linthicum, MD

                 
 

1460 Dorsey Road

  BWI Airport     6     60,000  
   

Hanover, MD

                 
 

Columbia Gateway Parcel T-11

  Howard Co. Perimeter     14     220,000  
   

Columbia, MD

                 
 

7125 Columbia Gateway Drive

  Howard Co. Perimeter     8     275,000  
   

Columbia, MD

                 
 

Riverwood

  Howard Co. Perimeter     5     27,000  
   

Columbia, MD

                 
               
 

Subtotal

        201     1,782,000  
               

Northern Virginia:

                 
 

Westfields Corporate Center

  Dulles South     23     400,000  
   

Chantilly, VA

                 
 

Westfields—Park Center

  Dulles South     33     674,000  
   

Chantilly, VA

                 
 

Patriot Ridge

  Springfield     11     738,000  
   

Springfield, VA

                 
 

Woodland Park

  Herndon     5     225,000  
   

Herndon, VA

                 
               
 

Subtotal

        72     2,037,000  
               

Suburban Maryland:

                 
 

Thomas Johnson Drive

  Frederick     6     170,000  
   

Frederick, MD

                 
 

Route 15 / Biggs Ford Road

  Frederick     107     1,000,000  
   

Frederick, MD

                 
 

Rockville Corporate Center

  Rockville     10     220,000  
   

Rockville, MD

                 
               
 

Subtotal

        123     1,390,000  
               

St. Mary's & King George Counties:

                 
 

Dahlgren Technology Center

  King George County     39     122,000  
   

Dahlgren, MD

                 
 

Expedition VII

  St. Mary's County     6     60,000  
   

Lexington Park, MD

                 
               
 

Subtotal

        45     182,000  
               

34


Table of Contents

Land Location
  Submarket   Acres   Estimated
Developable
Square
Feet
 

Greater Baltimore:

                 
 

Canton Crossing

  Baltimore     10     773,000  
   

Baltimore, MD

                 
 

White Marsh

  White Marsh     152     1,692,000  
   

White Marsh, MD

                 
 

37 Allegheny Avenue

  Towson     0.3     40,000  
   

Towson, MD

                 
 

Northgate Business Park

  Harford County     34     439,000  
   

Aberdeen, MD

                 
               
 

Subtotal

        196     2,944,000  
               

Colorado Springs:

                 
 

InterQuest

  I-25 North Corridor     113     1,623,000  
   

Colorado Springs, CO

                 
 

9965 Federal Drive

  I-25 North Corridor     4     30,000  
   

Colorado Springs, CO

                 
 

Patriot Park

  Colorado Springs East     71     756,000  
   

Colorado Springs, CO

                 
 

Aerotech Commerce

  Colorado Springs East     6     90,000  
   

Colorado Springs, CO

                 
               
 

Subtotal

        194     2,499,000  
               

San Antonio:

                 
 

Northwest Crossroads

  San Antonio Northwest     31     375,000  
   

San Antonio, TX

                 
 

Military Drive

  San Antonio Northwest     37     658,000  
   

San Antonio, TX

                 
               
 

Subtotal

        68     1,033,000  
               

Greater Philadelphia:

                 
 

Arborcrest

  Blue Bell     8     790,000  
   

Blue Bell, PA

                 
               

Other:

                 
 

Fort Ritchie(1)

  Fort Ritchie     591     1,700,000  
   

Cascade, MD

                 
               
 

Total Land

        1,497     14,357,000  
               

(1)
The Fort Ritchie acquisition includes 284,000 square feet of existing office space targeted for future development and 110 existing usable residential units.

        The following table provides certain information about our wholly owned wholesale data center property as of December 31, 2010:

Property and Location
  Year
Built
  Gross
Building
Area
  Raised
Floor
Square
Footage(1)
  Initial
Stabilization
Critical Load
(in MWs)(2)
  Critical Load
Upon Completion
Leased at
December 31,
2010
  MW
Operational
 

9651 Hornbaker Road

    2010     233,000     100,000     18     17 %   11 %
 

Manassas, Virginia

                                     

(1)
Raised floor square footage is that portion of the gross building area in which tenants locate their computer servers. Raised floor area is considered to be the net rentable square footage.

(2)
Critical load is the power available for exclusive use of tenants in the property (expressed in terms of megawatts ("MWs")).

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Table of Contents

        The following table provides certain information about our joint venture office properties as of December 31, 2010:

Property and Location
  Submarket   Year Built/
Renovated
  Rentable
Square
Feet
  Occupancy(1)   Annualized
Rental
Revenue(2)
  Annualized
Rental
Revenue per
Occupied
Square
Foot(2)(3)
 

Baltimore/Washington Corridor:

                                   
 

7740 Milestone Parkway

  BWI Airport     2009     143,939     6.0 % $ 275,428   $ 31.79  
   

Hanover, MD

                                   
                                 
 

Subtotal/Average

              143,939     6.0 % $ 275,428   $ 31.79  
                                 

Suburban Maryland:

                                   
 

4230 Forbes Boulevard

  Lanham     2003     55,866     91.0 % $ 830,430   $ 16.34  
   

Prince Georges, MD

                                   
 

5825 University Research Drive

  College Park     2008     118,528     74.8 %   2,432,546     27.45  
   

College Park, MD

                                   
 

5850 University Research Drive

  College Park     2009     123,464     100.0 %   3,666,881     29.70  
   

College Park, MD

                                   
                                 
 

Subtotal/Average

              297,858     88.3 % $ 6,929,857   $ 26.36  
                                 

Greater Harrisburg:

                                   
 

2605 Interstate Drive

  East Shore     1990     79,456     100.0 % $ 1,476,292   $ 18.58  
   

Harrisburg, PA

                                   
 

6345 Flank Drive

  East Shore     1989     69,443     63.0 %   631,200     14.42  
   

Harrisburg, PA

                                   
 

6340 Flank Drive

  East Shore     1988     68,200     100.0 %   833,399     12.22  
   

Harrisburg, PA

                                   
 

2601 Market Place

  East Shore     1989     65,411     90.0 %   1,169,776     19.88  
   

Harrisburg, PA

                                   
 

6400 Flank Drive

  East Shore     1992     52,439     75.5 %   542,041     13.69  
   

Harrisburg, PA

                                   
 

6360 Flank Drive

  East Shore     1988     46,589     46.1 %   287,330     13.37  
   

Harrisburg, PA

                                   
 

6385 Flank Drive

  East Shore     1995     32,671     62.6 %   299,338     14.63  
   

Harrisburg, PA

                                   
 

6380 Flank Drive

  East Shore     1991     32,668     80.6 %   403,544     15.32  
   

Harrisburg, PA

                                   
 

6405 Flank Drive

  East Shore     1991     32,000     0.0 %        
   

Harrisburg, PA

                                   
 

95 Shannon Road

  East Shore     1999     21,976     100.0 %   330,760     15.05  
   

Harrisburg, PA

                                   
 

75 Shannon Road

  East Shore     1999     20,887     0.0 %        
   

Harrisburg, PA

                                   
 

6375 Flank Drive

  East Shore     2000     19,783     71.3 %   304,622     21.59  
   

Harrisburg, PA

                                   
 

85 Shannon Road

  East Shore     1999     12,863     100.0 %   193,601     15.05  
   

Harrisburg, PA

                                   
 

5035 Ritter Road

  West Shore     1988     56,556     100.0 %   942,866     16.67  
   

Mechanicsburg, PA

                                   
 

5070 Ritter Road—Building A

  West Shore     1989     31,710     36.4 %   167,553     14.51  
   

Mechanicsburg, PA

                                   
 

5070 Ritter Road—Building B

  West Shore     1989     28,347     82.0 %   280,843     12.08  
   

Mechanicsburg, PA

                                   
 

Subtotal/Average

              670,999     74.3 % $ 7,863,165   $ 15.78  
                                 
 

Total/Average

              1,112,796     69.2 % $ 15,068,450   $ 19.57  
                                 

(1)
This percentage is based upon all rentable square feet under lease terms that were in effect at December 31, 2010.

(2)
Annualized rental revenue is the monthly contractual base rent as of December 31, 2010 multiplied by 12, plus the estimated annual expense reimbursements under existing leases.

(3)
Annualized rental revenue per occupied square foot is the property's annualized rental revenue divided by that property's occupied square feet as of December 31, 2010.

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        The following table provides certain information about office properties owned through a joint venture that were under development as of December 31, 2010:

Property and Location
  Submarket   Estimated
Rentable
Square Feet
Upon Completion
 

Huntsville:

           

Redstone Gateway (Building 1)

  Huntsville     115,000  
 

Huntsville, AL

           

Redstone Gateway (Building 2)

  Huntsville     120,000  
 

Huntsville, AL

           
           

Total Under Development

        235,000  
           

        The following table provides certain information about our developable land holdings through joint ventures that were not under construction or development as of December 31, 2010, including properties under ground lease to us:

Land Location
  Submarket   Acres   Estimated
Developable
Square Feet
 

Baltimore/Washington Corridor:

                 
 

Arundel Preserve(1)

  BWI Airport     56     Up to 1,652,000  
     

Hanover, MD

                 

Suburban Maryland:

                 
 

M Square Research Park(1)

  College Park     49     510,000  
   

College Park, MD

                 

Huntsville:

                 
 

Redstone Gateway(1)

  Huntsville     458     4,360,000  
   

Huntsville, AL

                 

Other:

                 
 

Indian Head

  Charles County     192     967,000  
   

Charles County, MD

                 
               
 

Total Land

        755     7,489,000  
               

(1)
This land was not owned at December 31, 2010 but was under contract.

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Lease Expirations

        The following table provides a summary schedule of the lease expirations for leases in place at our wholly owned office properties as of December 31, 2010, assuming that none of the tenants exercise renewal options. This analysis includes the effect of early renewals completed on existing leases but excludes the effect of new tenant leases on 266,125 square feet executed but yet to commence as of December 31, 2010.

Year of Lease Expiration(1)
  Number of
Leases
Expiring
  Square
Footage
of Leases
Expiring
  Percentage of
Total Occupied
Square Feet
  Annualized
Rental of
Expiring
Leases(2)
  Percentage of
Total Annualized
Rental Revenue
Expiring(2)
  Total Annualized
Rental Revenue of
Expiring Leases
Per Occupied
Square Foot
 
 
   
   
   
  (in thousands)
   
   
 

2011

    161     1,922,024     10.9 % $ 46,878     10.4 % $ 24.39  

2012

    144     2,564,566     14.5 %   57,306     12.7 %   22.35  

2013

    131     2,164,148     12.3 %   59,939     13.3 %   27.70  

2014

    108     1,874,195     10.6 %   49,237     10.9 %   26.27  

2015

    123     2,563,807     14.5 %   65,119     14.5 %   25.40  

2016

    58     1,251,370     7.1 %   32,654     7.2 %   26.09  

2017

    44     1,306,785     7.4 %   37,076     8.2 %   28.37  

2018

    29     906,744     5.1 %   23,020     5.1 %   25.39  

2019

    20     477,740     2.7 %   10,701     2.4 %   22.40  

2020

    20     1,032,829     5.9 %   27,092     6.0 %   26.23  

2021

    8     318,017     1.8 %   7,154     1.6 %   22.49  

2022

    4     374,991     2.1 %   10,502     2.3 %   28.01  

2023

    2     52,899     0.3 %   1,155     0.3 %   21.84  

2025

    4     555,370     3.2 %   17,373     3.9 %   31.28  

Other(3)

    27     262,037     1.5 %   5,361     1.2 %   20.46  
                             

Total/Weighted Average

    883     17,627,522     100.0 % $ 450,568     100.0 % $ 25.56  
                             

(1)
Most of our leases with the United States Government provide for consecutive one-year terms or provide for early termination rights. All of the leasing statistics set forth above assumed that the United States Government will remain in the space that it leases through the end of the respective arrangements, without ending consecutive one-year leases prematurely or exercising early termination rights. We reported the statistics in this manner because we manage our leasing activities using these same assumptions and believe these assumptions to be probable.

(2)
Annualized rental revenue is the monthly contractual base rent as of December 31, 2010 multiplied by 12, plus the estimated annualized expense reimbursements under existing office leases.

(3)
Other consists primarily of month-to-month leases and leases that have expired but the tenant remains in holdover as the exact expiration date is unknown.

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        The following table provides a summary schedule of the lease expirations for leases in place at our wholly owned wholesale data center property as of December 31, 2010:

Year of Lease Expiration(1)
  Number of
Leases
Expiring
  Raised Floor
Square Footage
Expiring
  Critical
Load Leased
(in megawatts)
  Critical
Load Used
(in megawatts)
  Annualized
Rental of
Expiring Leases(2)
 
 
   
   
   
   
  (in thousands)
 

2019

    1     7,172     1     1   $ 2,017  

2020

    1     12,773     2     1     1,900  
                       

Total/Weighted Average

    2     19,945     3     2   $ 3,917  
                       

Item 3.    Legal Proceedings

        Jim Lemon and Robin Biser, as plaintiffs, initiated a suit on May 12, 2005, in The United States District Court for the District of Columbia (Case No. 1:05CV00949), against The Secretary of the United States Army, PenMar Development Corporation ("PMDC") and the Company, as defendants, in connection with the then pending acquisition by the Company of the former army base known as Fort Ritchie located in Cascade, Maryland. The case was dismissed by the United States District Court on September 28, 2006, due to the plaintiffs' lack of standing. The plaintiffs filed an appeal in the case in the United States Court of Appeals for the District of Columbia Circuit and the Court of Appeals reversed the findings of the District Court and remanded the case to the District Court for further proceedings. The plaintiffs were unsuccessful in their request for an emergency injunction pending appeal. The Company acquired from PMDC fee simple title to 500 acres of the 591 acres comprising Fort Ritchie on October 5, 2006 and the remaining 91 acres on November 29, 2007.

        On November 10, 2009, the District Court issued an Order, together with a Memorandum Opinion, which precludes the Company from proceeding with the implementation of its development plan until the Army either re-issues an amended Record of Environmental Consideration ("REC") or a Supplemental Environmental Impact Statement ("SEIS") that complies with the District Court's Memorandum Opinion. The Memorandum Opinion highlights various areas of the existing REC which could be revised to include greater detail on the Army's deliberative process whereby the Army determined that a SEIS was not necessary. We are working with both the Army's counsel and the Army representative on re-submission of the amended REC to the Court in order to lift the restrictions imposed by the Court.

        On January 8, 2010, the Army filed an appeal in the United States Court of Appeals for the District of Columbia Circuit, and, on January 19, 2011, the appeal was dismissed. On January 21, 2011, the District Court issued an order for the parties to meet and confer to provide a status report to the Court on or before February 4, 2011 and the Court has approved an extended filing date of February 18, 2011. In the event that this matter is not favorably resolved, we may be unable to execute our development plans for the property, which could render us unable to recover some or all of our investment made in the property. As of December 31, 2010, the carrying value of our investment in the property was $27.7 million.

        We are not currently involved in any other material litigation nor, to our knowledge, is any material litigation currently threatened against the Company (other than routine litigation arising in the ordinary course of business, substantially all of which is expected to be covered by liability insurance).

Item 4.    Removed and Reserved

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PART II

Item 5.    Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Information

        Our common shares trade on the New York Stock Exchange ("NYSE") under the symbol "OFC." The table below shows the range of the high and low sale prices for our common shares as reported on the NYSE, as well as the quarterly common share dividends per share declared:

 
  Price Range    
 
 
  Dividends
Per Share
 
2009
  Low   High  

First Quarter

  $ 20.49   $ 30.92   $ 0.3725  

Second Quarter

  $ 23.13   $ 33.14   $ 0.3725  

Third Quarter

  $ 26.87   $ 40.59   $ 0.3925  

Fourth Quarter

  $ 31.77   $ 38.29   $ 0.3925  

 

 

 

 

 

 

 

 

 

 

 
 
  Price Range    
 
 
  Dividends
Per Share
 
2010
  Low   High  

First Quarter

  $ 32.69   $ 42.44   $ 0.3925  

Second Quarter

  $ 34.82   $ 43.61   $ 0.3925  

Third Quarter

  $ 35.04   $ 39.85   $ 0.4125  

Fourth Quarter

  $ 33.33   $ 38.96   $ 0.4125  

        The number of holders of record of our common shares was 640 as of December 31, 2010. This number does not include shareholders whose shares are held of record by a brokerage house or clearing agency, but does include any such brokerage house or clearing agency as one record holder.

        We will pay dividends at the discretion of our Board of Trustees. Our ability to pay cash dividends will be dependent upon: (1) the income and cash flow generated from our operations; (2) cash generated or used by our financing and investing activities; and (3) the annual distribution requirements under the REIT provisions of the Code described above and such other factors as the Board of Trustees deems relevant. Our ability to make cash dividends will also be limited by the terms of our Operating Partnership Agreement, as well as by limitations imposed by state law. In addition, we are prohibited from paying cash dividends in excess of the amount necessary for us to qualify for taxation as a REIT if a default or event of default exists pursuant to the terms of our Revolving Credit Facility; this restriction does not currently limit our ability to pay dividends, and we do not believe that this restriction is reasonably likely to limit our ability to pay future dividends because we expect to comply with the terms of our Revolving Credit Facility.

Unregistered Sales of Equity Securities and Use of Proceeds

        During the three months ended December 31, 2010, 42,900 of the Operating Partnership's common units were exchanged for 42,900 common shares in accordance with the Operating Partnership's Second Amended and Restated Limited Partnership Agreement, as amended. The issuance of these common shares was effected in reliance upon the exemption from registration under Section 4(2) of the Securities Act of 1933, as amended.

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Common Shares Performance Graph

        The graph and the table set forth below assume $100 was invested on December 31, 2005 in the common shares of Corporate Office Properties Trust. The graph and the table compare the cumulative return (assuming reinvestment of dividends) of this investment with a $100 investment at that time in the S&P 500 Index or the All Equity REIT Index of the National Association of Real Estate Investment Trusts ("NAREIT"):

CHART

 
  Period Ended  
Index
  12/31/05   12/31/06   12/31/07   12/31/08   12/31/09   12/31/10  

Corporate Office Properties Trust

    100.00     145.77     94.04     95.71     119.91     119.34  

S&P 500

    100.00     115.79     122.16     76.96     97.33     111.99  

NAREIT All Equity REIT Index

    100.00     135.06     113.87     70.91     90.76     116.12  

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Item 6.    Selected Financial Data

        The following table sets forth summary financial data as of and for each of the years ended December 31, 2006 through 2010. The table illustrates the significant growth we experienced over the periods reported. Most of this growth, particularly pertaining to revenues from real estate operations and total assets, was attributable to our addition of properties through acquisition and development activities. We financed most of the acquisition and development activities by incurring debt and issuing common equity, as indicated by the growth in our interest expense and weighted average common shares outstanding. The growth in our general and administrative expenses reflects, in large part, the growth in management resources required to support the increased size of our portfolio. Since this information is only a summary, you should refer to our consolidated financial statements and notes thereto and the section of this report entitled "Management's Discussion and Analysis of Financial Condition and Results of Operations" for additional information.


Corporate Office Properties Trust and Subsidiaries
(in thousands, except per share data and number of properties)

 
  2010   2009   2008   2007   2006  

Revenues

                               
 

Revenues from real estate operations(1)

  $ 459,800   $ 423,984   $ 396,760   $ 362,770   $ 287,815  
 

Construction contract and other service revenues

    104,675     343,087     188,385     41,225     60,084  
                       
   

Total revenues

    564,475     767,071     585,145     403,995     347,899  
                       

Expenses

                               
 

Property operating expenses(1)

    179,419     157,154     140,895     122,794     92,187  
 

Depreciation and amortization associated with real estate operations(1)

    123,236     108,529     101,854     103,824     75,469  
 

Construction contract and other service expenses

    102,302     336,519     184,142     39,793     57,345  
 

General and administrative expenses

    24,008     23,240     24,096     20,227     17,441  
 

Business development expenses

    4,197     3,699     1,233     1,477     607  
                       
   

Total operating expenses

    433,162     629,141     452,220     288,115     243,049  
                       

Operating income

    131,313     137,930     132,925     115,880     104,850  

Interest expense

    (101,865 )   (82,187 )   (86,368 )   (88,070 )   (73,395 )

Interest and other income

    9,568     5,164     2,070     3,030     1,077  

Gain on early extinguishment of debt

            8,101          
                       

Income from continuing operations before equity in income (loss) of unconsolidated entities and income taxes

    39,016     60,907     56,728     30,840     32,532  

Equity in income (loss) of unconsolidated entities

    1,376     (941 )   (147 )   (224 )   (92 )

Income tax expense

    (108 )   (196 )   (201 )   (569 )   (887 )
                       

Income from continuing operations

    40,284     59,770     56,380     30,047     31,553  

Discontinued operations(1)(2)

    2,391     1,529     3,832     3,858     23,546  
                       

Income before gain on sales of real estate

    42,675     61,299     60,212     33,905     55,099  

Gain on sales of real estate, net of income taxes(1)(3)

    2,829         1,104     2,037     889  
                       

Net income

    45,504     61,299     61,316     35,942     55,988  

Net income attributable to noncontrolling interests

    (2,744 )   (4,970 )   (7,351 )   (3,741 )   (7,621 )
                       

Net income attributable to Corporate Office Properties Trust

    42,760     56,329     53,965     32,201     48,367  

Preferred share dividends

    (16,102 )   (16,102 )   (16,102 )   (16,068 )   (15,404 )

Issuance costs associated with redeemed preferred shares(4)

                    (3,896 )
                       

Net income attributable to Corporate Office Properties Trust common shareholders

  $ 26,658   $ 40,227   $ 37,863   $ 16,133   $ 29,067  
                       

Basic earnings per common share(5)

                               
 

Income from continuing operations

  $ 0.39   $ 0.68   $ 0.70   $ 0.27   $ 0.22  
 

Net income

  $ 0.43   $ 0.70   $ 0.77   $ 0.34   $ 0.69  

Diluted earnings per common share(5)

                               
 

Income from continuing operations

  $ 0.39   $ 0.68   $ 0.69   $ 0.26   $ 0.21  
 

Net income

  $ 0.43   $ 0.70   $ 0.76   $ 0.33   $ 0.67  

Weighted average common shares outstanding—basic

    59,611     55,930     48,132     46,527     41,463  

Weighted average common shares outstanding—diluted

    59,944     56,407     48,820     47,518     43,031  

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Table of Contents

 
  2010   2009   2008   2007   2006  

Balance Sheet Data (as of year end):

                               

Investment in real estate

  $ 3,445,455   $ 3,029,900   $ 2,778,466   $ 2,604,836   $ 2,111,517  

Total assets

  $ 3,844,517   $ 3,380,022   $ 3,114,239   $ 2,932,364   $ 2,419,329  

Debt

  $ 2,323,681   $ 2,053,841   $ 1,856,751   $ 1,809,610   $ 1,478,460  

Total liabilities

  $ 2,521,379   $ 2,259,390   $ 2,031,816   $ 1,962,884   $ 1,609,034  

Total equity

  $ 1,323,138   $ 1,120,632   $ 1,082,423   $ 969,480   $ 810,295  

Other Financial Data (for the year ended):

                               

Cash flows provided by (used in):

                               
 

Operating activities

  $ 156,436   $ 194,817   $ 180,892   $ 138,391   $ 113,358  
 

Investing activities

  $ (479,167 ) $ (349,076 ) $ (290,822 ) $ (328,404 ) $ (254,041 )
 

Financing activities

  $ 324,571   $ 155,746   $ 92,067   $ 206,728   $ 137,822  

Numerator for diluted EPS

  $ 25,587   $ 39,217   $ 37,135   $ 15,616   $ 28,618  

Diluted funds from operations(6)

  $ 148,645   $ 152,626   $ 143,592   $ 121,371   $ 97,165  

Diluted funds from operations per share(6)

  $ 2.30   $ 2.46   $ 2.52   $ 2.17   $ 1.89  

Cash dividends declared per common share

  $ 1.61   $ 1.53   $ 1.425   $ 1.30   $ 1.18  

Property Data (as of year end):

                               

Number of properties owned(1)(7)

    252     245     235     227     170  

Total rentable square feet owned(1)(7)

    19,990     19,086     18,452     17,827     15,050  

(1)
Certain prior period amounts pertaining to properties included in discontinued operations have been reclassified to conform with the current presentation. These reclassifications did not affect consolidated net income or shareholders' equity.

(2)
Includes income derived from seven operating real estate properties we sold in 2006, four operating real estate properties we sold in 2007, three operating real estate properties we sold in 2008 and three operating real estate properties we sold in 2010 (see Note 18 to our consolidated financial statements).

(3)
Reflects gain from sales of properties and unconsolidated real estate joint ventures not associated with discontinued operations.

(4)
Reflects a decrease to net income available to common shareholders pertaining to the original issuance costs recognized upon the redemption of the Series E and Series F preferred shares of beneficial interest in 2006.

(5)
Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

(6)
For definitions of diluted funds from operations per share and diluted funds from operations and reconciliations of these measures to their comparable measures under generally accepted accounting principles, you should refer to the section entitled "Funds from Operations" within the section entitled "Management's Discussion and Analysis of Financial Condition and Results of Operations."

(7)
Amounts reported reflect only wholly owned office properties.

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Item 7.    Management's Discussion and Analysis of Financial Condition and Results of Operations

        You should refer to our consolidated financial statements and the notes thereto and our Selected Financial Data table as you read this section.

        This section contains "forward-looking" statements, as defined in the Private Securities Litigation Reform Act of 1995, that are based on our current expectations, estimates and projections about future events and financial trends affecting the financial condition and operations of our business. Forward-looking statements can be identified by the use of words such as "may," "will," "should," "could," "believe," "anticipate," "expect," "estimate," "plan" or other comparable terminology. Forward-looking statements are inherently subject to risks and uncertainties, many of which we cannot predict with accuracy and some of which we might not even anticipate. Although we believe that the expectations, estimates and projections reflected in such forward-looking statements are based on reasonable assumptions at the time made, we can give no assurance that these expectations, estimates and projections will be achieved. Future events and actual results may differ materially from those discussed in the forward-looking statements. Important factors that may affect these expectations, estimates and projections include, but are not limited to:

    general economic and business conditions, which will, among other things, affect office property demand and rents, tenant creditworthiness, interest rates and financing availability;

    adverse changes in the real estate markets, including, among other things, increased competition with other companies;

    our ability to borrow on favorable terms;

    risks of real estate acquisition and development activities, including, among other things, risks that development projects may not be completed on schedule, that tenants may not take occupancy or pay rent or that development and operating costs may be greater than anticipated;

    risks of investing through joint venture structures, including risks that our joint venture partners may not fulfill their financial obligations as investors or may take actions that are inconsistent with our objectives;

    changes in our plans for properties or views of market economic conditions or failure to obtain development rights, either of which could result in recognition of impairment losses;

    our ability to satisfy and operate effectively under Federal income tax rules relating to real estate investment trusts and partnerships;

    governmental actions and initiatives; and

    environmental requirements.

        We undertake no obligation to update or supplement forward-looking statements.

Overview

        We are a specialty office real estate investment trust ("REIT") that focuses primarily on strategic customer relationships and specialized tenant requirements in the United States Government and defense information technology sectors and data centers serving such sectors. We acquire, develop, manage and lease office and data center properties that are typically concentrated in large office parks primarily located adjacent to government demand drivers and/or in strong markets that we believe possess growth opportunities.

        Most of our revenues relating to real estate operations are derived from rents and property operating expense reimbursements earned from tenants leasing space in our properties. Most of our expenses relating to our real estate operations take the form of: (1) property operating costs, such as

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real estate taxes, utilities and repairs and maintenance; (2) interest costs; and (3) depreciation and amortization associated with our operating properties. Much of our profitability from real estate operations depends on our ability to maintain high levels of occupancy and increase rents, which is affected by a number of factors, including, among other things, our tenants' ability to fulfill their lease obligations and their continuing space needs based on, among other things, employment levels, business confidence and competition and general economic conditions of the markets in which we operate.

        As described further in Item 1 to this Annual Report on Form 10-K in the section entitled, "Business and Growth Strategies," our strategy for operations and growth focuses on establishing and nurturing long-term relationships with quality tenants and accommodating their multi-locational needs, particularly tenants in the United States Government and defense information technology sectors and data centers serving such sectors. As a result of this strategy, a large concentration of our revenue is derived from several large tenants. At December 31, 2010, 58.1% of our annualized rental revenue (as defined in the section entitled "Concentration of Operations") from wholly owned office properties was from our 20 largest tenants, 37.3% from our four largest tenants, 21.1% from our largest tenant, the United States Government, and 58.7% from properties occupied primarily by tenants in the United States Government and defense information technology sectors and data centers serving such sectors.

        Our operations in 2009 and 2010 were adversely affected by the challenging economic conditions in the United States. Most of our regions experienced job losses to varying extents, which resulted in decreased demand for space. This decreased demand for space increased competition for tenants, which collectively placed downward pressure on rental rates. These factors contributed to a decrease in our occupancy from 93.2% at December 31, 2008 to 88.2% at December 31, 2010 and decreased the extent to which we were able to increase rents on lease renewals and space retenanting. These factors also contributed to slower than expected leasing on a number of our newly constructed properties and decreased our pace for commencing construction on additional properties. We expect this challenging lease environment to continue at least through 2011, although we believe that the overall fundamentals for office leasing for us were either at, or near, bottom by year end.

        Our net income attributable to common shareholders decreased $13.6 million, or 34%, from 2009 to 2010. This decrease was due primarily to a $19.7 million increase in interest expense and a $6.6 million decrease in operating income, which were partially offset by a $6.0 million increase in gains recognized on our equity method investment in The KEYW Holding Corporation.

        One manner in which we evaluate the operating performance of our properties is through a measure we define as net operating income ("NOI") from real estate operations, which is derived by subtracting property operating expenses from revenues from real estate operations (please refer to the section below entitled "Results of Operations" for additional information pertaining to this measure). The amount of NOI from real estate operations included in income from continuing operations is referred to herein as NOI from continuing real estate operations. Our NOI from continuing real estate operations increased from 2009 to 2010 due primarily to NOI from newly acquired or newly constructed properties. However, this increase was offset by decreases of $8.0 million in NOI from properties that were owned and 100% operational in 2009 and 2010 (properties that we refer to collectively as "Same Office Properties") and $5.4 million from three vacant properties that we expect to redevelop.

        During 2010, we expanded our portfolio of office properties by:

    acquiring three operating office properties totaling 514,000 square feet that were 100% leased upon acquisition and a shell-complete office property totaling 183,000 square feet for $205.1 million; and

    placing into service an aggregate of 816,000 square feet in nine newly constructed office properties that were 77% leased at December 31, 2010; we expect all of these properties to be

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      certified under the U.S. Green Building Council's Leadership in Energy and Environmental Design ("LEED") program as LEED Silver or Gold.

Other investing activities in 2010 to increase our capacity for future growth included our:

    formation of LW Redstone Company, LLC, a joint venture created to develop Redstone Gateway, a 468-acre master-planned office business park adjacent to Redstone Arsenal in Huntsville, Alabama;

    entry into the Springfield, Virginia submarket by acquiring 15 acres on which we are entitled to develop up to 978,000 square feet adjacent to the new National Geospatial Intelligence Agency (NGA) headquarters at Fort Belvoir; and

    acquisition of a partially operational 233,000 square foot wholesale data center for $115.5 million that was 17% leased on the date of acquisition to two tenants that have a combined initial critical load of three megawatts and further expansion rights of up to a combined five megawatts. We expect to complete the development of the property to an initial stabilization critical load of 18 megawatts for additional development costs initially estimated at $166 million.

        Most of the investing activities described above were financed using borrowings from our unsecured revolving credit facility (the "Revolving Credit Facility") and construction loan agreement with an aggregate commitment by the lenders that is restorable (the "Revolving Construction Facility"). Our activities to restore and increase availability under our Revolving Credit Facility included our:

    issuance of a $240.0 million aggregate principal amount of 4.25% Exchangeable Senior Notes due in 2030 and redeemable by us, or subject to required repurchase upon request of the note holders, in April 2015 or thereafter as defined under the terms of the notes;

    issuance of 7.5 million common shares at a public offering price of $34.25 per share for net proceeds of $245.8 million after underwriting discounts but before offering expenses; and

    addition of new lenders under our Revolving Credit Facility to increase the borrowing capacity under the facility by $200.0 million, from $600.0 million to $800.0 million.

        We expect to satisfy our 2011 debt maturities and fund the construction of properties under construction at December 31, 2010 or expected to be started in 2011 using capacity under our credit facilities and by accessing the secured debt market, unsecured debt market and/or public equity market.

        We discuss significant factors contributing to changes in our net income attributable to our common shareholders and diluted earnings per share over the last three years in the section below entitled "Results of Operations." We discuss our 2010 investing and financing activities further in the section below entitled "Investing and Financing Activities During 2010." In addition, the section below entitled "Liquidity and Capital Resources" includes discussions of, among other things:

    how we expect to generate cash for short and long-term capital needs;

    our off-balance sheet arrangements in place that are reasonably likely to affect our financial condition; and

    our commitments and contingencies.

Critical Accounting Policies and Estimates

        Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP"), which require us to make certain estimates and assumptions. A summary of our significant accounting policies is provided in Note 2 to our consolidated financial statements. The following section is a summary of certain aspects of those accounting policies involving estimates and assumptions that (1) require our most difficult, subjective or

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complex judgments in accounting for uncertain matters or matters that are susceptible to change and (2) materially affect our reported operating performance or financial condition. It is possible that the use of different reasonable estimates or assumptions in making these judgments could result in materially different amounts being reported in our consolidated financial statements. While reviewing this section, you should refer to Note 2 to our consolidated financial statements, including terms defined therein.

Acquisitions of Properties

        When we acquire properties, we allocate the purchase price to numerous tangible and intangible components. Most of the terms in this bullet section are discussed in further detail in Note 2 to the consolidated financial statements entitled "Acquisitions of Properties." Our process for determining the allocation to these components requires many estimates and assumptions, including the following: (1) determination of market rental rates; (2) estimation of leasing and tenant improvement costs associated with the remaining term of acquired leases; (3) assumptions used in determining the in-place lease value, if-vacant value and tenant relationship value, including the rental rates, period of time that it will take to lease vacant space and estimated tenant improvement and leasing costs; and (4) allocation of the if-vacant value between land and building. A change in any of the above key assumptions, which are subjective, can materially change not only the presentation of acquired properties in our consolidated financial statements but also our reported results of operations. The allocation to different components affects the following:

    the amount of the purchase price allocated among different categories of assets and liabilities on our consolidated balance sheets; the amount of costs assigned to individual properties in multiple property acquisitions; and the amount of gain recognized in our consolidated statements of operations should we determine that the fair value of the acquisition exceeds its cost;

    where the amortization of the components appear over time in our consolidated statements of operations. Allocations to above- and below-market leases are amortized into rental revenue, whereas allocations to most of the other tangible and intangible assets are amortized into depreciation and amortization expense. As a REIT, this is important to us since much of the investment community evaluates our operating performance using non-GAAP measures such as funds from operations, the computation of which includes rental revenue but does not include depreciation and amortization expense; and

    the timing over which the items are recognized as revenue or expense in our consolidated statements of operations. For example, for allocations to the as-if vacant value, the land portion is not depreciated and the building portion is depreciated over a longer period of time than the other components (generally 40 years). Allocations to above- and below-market leases, in-place lease value and tenant relationship value are amortized over significantly shorter timeframes, and if individual tenants' leases are terminated early, any unamortized amounts remaining associated with those tenants are written off upon termination. These differences in timing can materially affect our reported results of operations. In addition, we establish lives for tenant relationship values based on our estimates of how long we expect the respective tenants to remain in the properties.

Impairment of Long-Lived Assets

        If events or changes in circumstances indicate that the carrying values of operating properties, properties in development or land held for future development may be impaired, we perform a recovery analysis based on the estimated undiscounted future cash flows to be generated from the operations and eventual disposition of such properties. If the analysis indicates that the carrying value of a tested property is not recoverable from estimated future cash flows, it is written down to its

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estimated fair value and an impairment loss is recognized. Fair values are determined based on estimated future cash flows using appropriate discount and capitalization rates or third-party valuations or appraisals. The estimated cash flows used for the impairment analysis and determining the fair values are based on our plans for the tested property and our views of market and economic conditions. The estimates consider matters such as current and future rental rates, occupancies for the tested property and comparable properties, estimated operating and capital expenditures and recent sales data for comparable properties. Determining the appropriate capitalization rate also requires significant judgment and is typically based on many factors, including the prevailing rate for the market or submarket, as well as the quality and location of the properties. Changes in the estimated future cash flows due to changes in our plans for a property, views of market and economic conditions and/or our ability to obtain development rights could result in recognition of impairment losses which, under the applicable accounting guidance, could be substantial.

        Properties held for sale are carried at the lower of their carrying values (i.e., cost less accumulated depreciation and any impairment loss recognized, where applicable) or estimated fair values less costs to sell. Accordingly, decisions to sell certain operating properties, properties in development or land held for development will result in impairment losses if carrying values of the specific properties exceed their estimated fair values less costs to sell. The estimates of fair value consider matters such as recent sales data for comparable properties and, where applicable, contracts or the results of negotiations with prospective purchasers. These estimates are subject to revision as market conditions, and our assessment of such conditions, change.

Assessment of Lease Term

        As discussed above, a significant portion of our portfolio is leased to the United States Government, and the majority of those leases consist of a series of one-year renewal options. Applicable accounting guidance requires us to recognize minimum rental payments on a straight-line basis over the terms of each lease and to assess the lease terms as including all periods for which failure to renew the lease imposes a penalty on the lessee in such amounts that a renewal appears, at the inception of the lease, to be reasonably assured. Factors to consider when determining whether a penalty is significant include the uniqueness of the purpose or location of the property, the availability of a comparable replacement property, the relative importance or significance of the property to the continuation of the lessee's line of business and the existence of leasehold improvements or other assets whose value would be impaired by the lessee vacating or discontinuing use of the leased property. We have concluded for a number of our leases, based on the factors above, that the United States Government's exercise of all of those renewal options is reasonably assured. Changes in these assessments could result in the write-off of any recorded assets associated with straight-line rental revenue and acceleration of depreciation and amortization expense associated with costs we have incurred related to these leases.

Revenue Recognition on Tenant Improvements

        Most of our leases involve some form of improvements to leased space. When we are required to provide improvements under the terms of a lease, we need to determine whether the improvements constitute landlord assets or tenant assets. If the improvements are landlord assets, we capitalize the cost of the improvements and recognize depreciation expense associated with such improvements over the shorter of the useful life of the assets or the term of the lease and recognize any payments from the tenant as rental revenue over the term of the lease. If the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset and amortize it as a reduction of rental revenue over the term of the lease. Our determination of whether improvements are landlord assets or tenant assets also may affect when we commence revenue recognition in connection with a lease.

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        In determining whether improvements constitute landlord or tenant assets, we consider numerous factors that may require subjective or complex judgments, including: whether the improvements are unique to the tenant or reusable by other tenants; whether the tenant is permitted to alter or remove the improvements without our consent or without compensating us for any lost fair value; whether the ownership of the improvements remains with us or remains with the tenant at the end of the lease term; and whether the economic substance of the lease terms is properly reflected.

Collectability of Accounts and Deferred Rent Receivable

        Allowances for doubtful accounts and deferred rent receivable are established based on quarterly analyses of the risk of loss on specific accounts. The analyses place particular emphasis on past-due accounts and consider information such as the nature and age of the receivables, the payment history of the tenants, the financial condition of the tenants and our assessment of their ability to meet their lease obligations, the basis for any disputes and the status of related negotiations. Our estimate of the required allowance is subject to revision as these factors change and is sensitive to the effects of economic and market conditions on tenants.

Accounting Method for Investments

        We use three different accounting methods to report our investments in entities: the consolidation method; the equity method; and the cost method (see Note 2 to our consolidated financial statements). We use the consolidation method when we own most of the outstanding voting interests in an entity and can control its operations. We also consolidate certain entities when control of such entities can be achieved through means other than voting rights ("variable interest entities" or "VIEs") if we are deemed to be the primary beneficiary. Generally, this applies when either (1) the equity investors (if any) lack one or more of the essential characteristics of a controlling financial interest; (2) the equity investment at risk is insufficient to finance that entity's activities without additional subordinated financial support; or (3) the equity investors have voting rights that are not proportionate to their economic interests and the activities of the entity involve, or are conducted on behalf of, an investor with a disproportionately small voting interest. We use the equity method of accounting when we own an interest in an entity and can exert significant influence over, but cannot control, the entity's operations.

        In making these determinations, we need to make subjective estimates and judgments regarding the entity's future operating performance, financial condition, future valuation and other variables that may affect the cash flows of the entity. We must consider both our and our partner's ability to participate in the management of the entity's operations and make decisions that allow the parties to manage their economic risks. We may also need to estimate the probability of different scenarios taking place over time and their effect on the partners' cash flows. The conclusion reached as a result of this process affects whether or not we use the consolidation method in accounting for our investment or the equity method. Whether or not we consolidate an investment can materially affect our consolidated financial statements.

Concentration of Operations

        We refer to the measure "annualized rental revenue" in various sections of the Management's Discussion and Analysis of Financial Condition and Results of Operations section of this Annual Report. Annualized rental revenue is a measure that we use to evaluate the source of our rental revenue as of a point in time. It is computed by multiplying by 12 the sum of monthly contractual base rents and estimated monthly expense reimbursements under active leases as of a point in time. We consider annualized rental revenue to be a useful measure for analyzing revenue sources because, since it is point-in-time based, it does not contain increases and decreases in revenue associated with periods in which lease terms were not in effect; historical revenue under GAAP does contain such fluctuations. We find the measure particularly useful for leasing, tenant, segment and industry analysis.

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Customer Concentration of Property Operations

        The following schedule lists our 20 largest tenants in our portfolio of wholly owned office properties based on percentage of annualized rental revenue:

 
  Percentage of Annualized
Rental Revenue of Wholly
Owned Office Properties
for 20 Largest Tenants
as of December 31,
 
Tenant
  2010   2009   2008  

United States of America

    21.1 %   18.6 %   17.3 %

Northrop Grumman Corporation(1)

    7.3 %   7.9 %   7.4 %

Booz Allen Hamilton, Inc. 

    4.7 %   5.0 %   5.2 %

Computer Sciences Corporation(1)

    4.2 %   2.9 %   3.1 %

ITT Corporation(1)

    1.8 %   1.7 %   1.8 %

The MITRE Corporation

    1.8 %   N/A     N/A  

The Aerospace Corporation(1)

    1.7 %   1.8 %   1.9 %

CareFirst, Inc. 

    1.7 %   1.6 %   N/A  

Wells Fargo & Company(1)

    1.7 %   1.8 %   1.7 %

L-3 Communications Holdings, Inc.(1)

    1.7 %   1.8 %   2.5 %

Integral Systems, Inc.(1)

    1.4 %   1.4 %   N/A  

Comcast Corporation(1)

    1.3 %   1.4 %   1.7 %

The Boeing Company(1)

    1.3 %   1.1 %   1.1 %

AT&T Corporation(1)

    1.2 %   1.4 %   1.4 %

Ciena Corporation

    1.1 %   1.0 %   1.1 %

General Dynamics Corporation(1)

    1.0 %   2.0 %   2.0 %

Unisys Corporation

    0.9 %   1.1 %   2.3 %

The Johns Hopkins Institutions(1)

    0.8 %   0.8 %   0.8 %

Merck & Co., Inc.(1)

    0.7 %   0.7 %   0.7 %

First Mariner Bank(1)

    0.7 %   N/A     N/A  

BAE Systems PLC(1)

    N/A     0.8 %   0.8 %

Lockheed Martin Corporation

    N/A     0.6 %   N/A  

Science Applications International Corporation

    N/A     N/A     0.8 %

Magellan Health Services, Inc. 

    N/A     N/A     0.7 %

AARP

    N/A     N/A     0.7 %
               

Subtotal of 20 largest tenants

    58.1 %   55.4 %   55.0 %

All remaining tenants

    41.9 %   44.6 %   45.0 %
               

Total

    100.0 %   100.0 %   100.0 %
               

(1)
Includes affiliated organizations and agencies and predecessor companies.

The United States Government increased in large part due to it taking occupancy of a significant portion of our newly-constructed square feet placed in service.

        Our properties occupied primarily by tenants in the United States Government and defense information technology sectors and data centers serving such sectors accounted for 58.7% of our annualized rental revenue from wholly owned office properties at December 31, 2010, an increase from 54.9% at December 31, 2009. This increase is due primarily to newly-constructed properties placed into service and acquisitions of operating properties. We believe that we are well positioned for future growth in the concentration of our revenue derived from customers in these sectors, as discussed further in the section in Item 1 to this Annual Report on Form 10-K entitled "Business and Growth Strategies." We generally classify the revenue from our leases into sector groupings based solely on our

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knowledge of the tenants' operations in leased space. We do not use independent sources such as Standard Industrial Classification codes for classifying our revenue into industry groupings and if we did, the resulting groupings would be materially different.

Geographic Concentration of Property Operations

        The table below sets forth the regional allocation of our annualized rental revenue of wholly owned office properties as of the end of the last three calendar years:

 
  Percentage of Annualized
Rental Revenue of Wholly
Owned Office Properties
as of December 31,
  Number of
Wholly Owned
Office Properties
as of December 31,
 
Region
  2010   2009   2008   2010   2009   2008  

Baltimore/Washington Corridor

    44.7 %   46.1 %   46.7 %   111     109     104  

Northern Virginia

    16.6 %   17.7 %   18.8 %   17     15     15  

Greater Baltimore

    15.1 %   15.7 %   13.1 %   66     64     63  

San Antonio

    5.8 %   3.6 %   2.6 %   8     6     5  

Colorado Springs

    5.3 %   6.0 %   5.7 %   21     21     17  

Washington, DC - Capitol Riverfront

    3.5 %   N/A     N/A     2     N/A     N/A  

St. Mary's and King George Counties

    3.0 %   3.3 %   3.4 %   18     18     18  

Suburban Maryland

    2.5 %   3.4 %   4.0 %   5     5     5  

Greater Philadelphia

    1.5 %   1.6 %   2.9 %   2     3     4  

Other

    2.0 %   2.6 %   2.8 %   2     4     4  
                           

    100.0 %   100.0 %   100.0 %   252     245     235  
                           

The most significant changes in our regional allocations set forth above was due to newly-constructed properties placed into service and acquisitions of operating office properties.

Occupancy and Leasing

Office Properties

        The tables below set forth occupancy information pertaining to our portfolio of wholly owned operating office properties:

 
  December 31,  
 
  2010   2009   2008  

Occupancy rates at year end

                   
 

Total

    88.2 %   90.7 %   93.2 %
 

Baltimore/Washington Corridor

    89.5 %   91.6 %   93.4 %
 

Northern Virginia

    91.9 %   96.6 %   97.4 %
 

Greater Baltimore

    85.0 %   80.3 %   83.1 %
 

San Antonio

    100.0 %   100.0 %   100.0 %
 

Colorado Springs

    76.2 %   85.8 %   94.3 %
 

Washington, DC - Capitol Riverfront

    98.5 %   N/A     N/A  
 

St. Mary's and King George Counties

    86.8 %   97.8 %   95.2 %
 

Suburban Maryland

    71.4 %   91.9 %   97.7 %
 

Greater Philadelphia

    100.0 %   100.0 %   100.0 %
 

Other

    100.0 %   100.0 %   100.0 %
   

Average contractual annual rental rate per square foot at year end(1)

  $ 25.56   $ 24.63   $ 22.40  

(1)
Includes estimated expense reimbursements.

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  Rentable
Square Feet
  Occupied
Square Feet
 
 
  (in thousands)
 

December 31, 2009

    19,086     17,310  

Square feet vacated upon lease expiration(1)

        (1,386 )

Square feet retenanted after lease expiration(2)

        943  

Square feet acquired, constructed or disposed

    1,112     963  

Other changes

    (208 )   (202 )
           

December 31, 2010

    19,990     17,628  
           

(1)
Includes lease terminations and space reductions occurring in connection with lease renewals.

(2)
Excludes retenanting of vacant square feet acquired or developed.

        Due in large part to the challenging economic conditions in the United States, most of our regions experienced job losses to varying extents, prompting businesses to close, downsize their space requirements or cancel or delay expansion plans. Some tenants with continued space needs were looking to lower their operating expenses and were hesitant to make long-term leasing commitments given the uncertainty in the economy. Tenants looking to renew leases were at times willing to do so only when the renewal was accompanied by a downsizing of space or reduction of rent. This decrease in demand for space contributed to occupancy rate decreases in our regions and increased competition for tenants from owners of other properties willing to offer aggressively lower rental rates or higher cost tenant improvement terms, resulting in downward pressure on rental rates. These factors contributed to the decreases in our occupancy rates reflected above and decreased the extent to which we were able to increase rental rates. We renewed 68% of the square footage of our lease expirations (including the effect of early renewals) for the year ended December 31, 2010.

        Much of the decrease in occupancy rates for certain of our regions with significant changes from December 31, 2009 to December 31, 2010 can be attributable to a small number of discrete events, including:

    119,000 square feet vacated in Northern Virginia upon the expiration of one tenant's leases in two properties;

    127,000 newly constructed square feet placed into service in Colorado Springs during 2010 that were unoccupied; and

    149,000 square feet vacated upon the expiration of two large leases in Suburban Maryland.

        While we expect the challenging lease environment to continue at least through 2011, we believe that the overall fundamentals for office leasing for us were either at, or near, bottom by December 31, 2010. We also believe that our customer and market strategies serve as advantages in the current lease environment since we expect the United States Government and defense information technology sectors to fuel economic growth in many of our regions. Military and civilian personnel are in the process of being relocated to government installations at Fort George G. Meade (in the Baltimore/Washington Corridor), Aberdeen Proving Ground (in the Greater Baltimore region), San Antonio, Redstone Arsenal (in Huntsville, Alabama) and Fort Belvoir (in Springfield, Virginia) in connection with mandates by the Base Realignment and Closure Commission of the United States Congress ("BRAC"). In addition, the newly-formed United States Cyber Command will be located at Fort George G. Meade. We expect the demand created by these government installations will not only help stabilize the leasing markets in these regions but also expect it will provide future growth for us due to the installations' proximity to many of our properties. While there has been increased speculation regarding future reductions in United States defense spending, we do not believe that such spending

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decreases, were they to occur, would significantly affect defense information technology, which is the primary nature of the activities for tenants in our sector concentration described above. On the contrary, we believe that United States spending for defense information technology could increase due to the increasing significance of these activities to national security.

        At December 31, 2010, we had 1.0 million square feet under construction that was 32% leased. We are constructing this space in anticipation of demand from the United States Government and defense information technology sectors and data centers serving such sectors. We believe that we need to commence construction on properties that are not pre-leased to a certain extent to enable us to meet demand from these sectors in a short timeframe.

        We believe that our continuing exposure to the challenging leasing environment is mitigated to a certain extent by the generally long-term nature of our leases and the staggered timing of our future lease expirations. Our weighted average lease term for wholly owned office properties at December 31, 2010 was approximately 4.9 years. The table below sets forth as of December 31, 2010 our scheduled lease expirations of wholly owned office properties by region in terms of percentage of annualized rental revenue:

 
  Year of Lease Expiration of Annualized Rental
Revenue of Wholly Owned Office Properties
   
 
 
  2011   2012   2013   2014   2015   Thereafter/
Other(1)
  Total  

Baltimore/Washington Corridor

    4.6 %   6.7 %   8.3 %   4.3 %   6.5 %   14.2 %   44.7 %

Northern Virginia

    1.5 %   1.1 %   0.9 %   3.1 %   4.9 %   5.1 %   16.6 %

Greater Baltimore

    1.7 %   2.4 %   1.8 %   1.2 %   1.5 %   6.5 %   15.1 %

San Antonio

    0.0 %   0.3 %   0.0 %   0.0 %   0.0 %   5.5 %   5.8 %

Colorado Springs

    0.6 %   0.4 %   0.5 %   0.8 %   0.4 %   2.6 %   5.3 %

Washington, DC - Capitol Riverfront

    1.0 %   0.0 %   1.3 %   0.7 %   0.3 %   0.3 %   3.5 %

St. Mary's and King George Counties

    0.5 %   1.1 %   0.4 %   0.2 %   0.3 %   0.4 %   3.0 %

Suburban Maryland

    0.5 %   0.1 %   0.1 %   0.6 %   0.6 %   0.7 %   2.5 %

Greater Philadelphia

    0.0 %   0.6 %   0.0 %   0.0 %   0.0 %   0.9 %   1.5 %

Other

    0.0 %   0.0 %   0.0 %   0.0 %   0.0 %   2.0 %   2.0 %
                               

Total

    10.4 %   12.7 %   13.3 %   10.9 %   14.5 %   38.2 %   100.0 %
                               

(1)
Other includes 1.2% representing primarily month-to-month leases and leases that have expired but the tenant remains in holdover as the exact expiration date is unknown.

        As noted above, most of the leases with our largest tenant, the United States Government, provide for consecutive one-year terms or provide for early termination rights; all of the leasing statistics set forth above assume that the United States Government will remain in the space that they lease through the end of the respective arrangements, without ending consecutive one-year leases prematurely or exercising early termination rights.

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        The table below sets forth occupancy information pertaining to operating office properties in which we have a partial ownership interest:

 
   
  Occupancy Rates at
December 31,
 
 
  Ownership
Interest
 
Geographic Region
  2010   2009   2008  

Greater Harrisburg, Pennsylvania(1)

    20.0 %   74.3 %   79.0 %   89.4 %

Suburban Maryland(2)

    (2 )   88.3 %   84.1 %   94.8 %

Baltimore/Washington Corridor(3)

    50.0 %   6.0 %   6.0 %   N/A  

(1)
Includes 16 properties totaling 671,000 square feet.

(2)
Includes three properties totaling 298,000 operational square feet at December 31, 2010 and 2009 (we had a 50% interest in 298,000 square feet at December 31, 2010, and a 45% interest in 242,000 square feet and 50% interest in 56,000 square feet at December 31, 2009). Includes two properties totaling 97,000 operational square feet at December 31, 2008 (we had a 50% interest in 56,000 square feet and a 45% interest in 41,000 square feet).

(3)
Includes one property with 144,000 operational square feet at December 31, 2010 and 2009.

Wholesale Data Center Property

        Our shell-complete wholesale data center property was 17% leased at December 31, 2010 through at least 2019 to tenants with an initial critical load of three megawatts and further expansion rights of up to a combined five megawatts. We expect to complete the development of the property to an initial stabilization critical load of 18 megawatts. We believe that the property is in a strong market and expect it to be fully leased in two to three years.

Results of Operations

        As discussed above, one manner in which we evaluate the operating performance of our properties is through a measure we define as NOI from real estate operations, which is derived by subtracting property operating expenses from revenues from real estate operations. We believe that NOI from real estate operations is an important supplemental measure of performance for a REIT's operating real estate because it provides a measure of the core operations that is unaffected by depreciation, amortization, financing and general and administrative expenses; this measure is particularly useful in our opinion in evaluating the performance of geographic segments, same-office property groupings and individual properties. The amount of NOI from real estate operations included in income from continuing operations is referred to herein as NOI from continuing real estate operations. We view our NOI from continuing real estate operations as being comprised of the following primary categories:

    operating properties owned and 100% operational throughout the two years being compared. We define these as changes from "Same Office Properties." For further discussion of the concept of "operational," you should refer to the section of Note 2 of the consolidated financial statements entitled "Properties"

    operating properties acquired during the two years being compared; and

    constructed properties placed into service that were not 100% operational throughout the two years being compared.

        In addition to owning real estate properties, we provide construction contract and other services. The primary manner in which we evaluate the operating performance of our construction contract and other services is through a measure we define as NOI from service operations, which is based on the net of the revenues and expenses from these activities. The revenues and expenses from these activities

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consist primarily of subcontracted costs that are reimbursed to us by customers along with a management fee. The operating margins from these activities are small relative to the revenue. We believe NOI from service operations is a useful measure in assessing both our level of activity and our profitability in conducting such operations.

        We believe that operating income, as reported on our consolidated statements of operations, is the most directly comparable GAAP measure for both NOI from continuing real estate operations and NOI from service operations. Since both of these measures exclude certain items includable in operating income, reliance on these measures has limitations; management compensates for these limitations by using the measures simply as supplemental measures that are considered alongside other GAAP and non-GAAP measures.

        The table below reconciles NOI from continuing real estate operations and NOI from service operations to operating income reported on our consolidated statement of operations (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

NOI from continuing real estate operations

  $ 280,381   $ 266,830   $ 255,865  

NOI from service operations

    2,373     6,568     4,243  

Depreciation and amortization associated

                   
 

with continuing real estate operations

    (123,236 )   (108,529 )   (101,854 )

General and administrative expense

    (24,008 )   (23,240 )   (24,096 )

Business development expenses

    (4,197 )   (3,699 )   (1,233 )
               

Operating income

  $ 131,313   $ 137,930   $ 132,925  
               

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Comparison of the Year Ended December 31, 2010 to the Year Ended December 31, 2009

 
  For the Years Ended December 31,  
 
  2010   2009   Variance  
 
  (Dollars in thousands)
 

Revenues

                   
 

Revenues from real estate operations

  $ 459,800   $ 423,984   $ 35,816  
 

Construction contract and other service revenues

    104,675     343,087     (238,412 )
               
   

Total revenues

    564,475     767,071     (202,596 )
               

Expenses

                   
 

Property operating expenses

    179,419     157,154     22,265  
 

Depreciation and amortization associated with real estate operations

    123,236     108,529     14,707  
 

Construction contract and other service expenses

    102,302     336,519     (234,217 )
 

General and administrative expense

    24,008     23,240     768  
 

Business development expenses

    4,197     3,699     498  
               
   

Total operating expenses

    433,162     629,141     (195,979 )
               

Operating income

    131,313     137,930     (6,617 )

Interest expense

    (101,865 )   (82,187 )   (19,678 )

Interest and other income

    9,568     5,164     4,404  

Equity in income (loss) of unconsolidated entities

    1,376     (941 )   2,317  

Income tax expense

    (108 )   (196 )   88  
               

Income from continuing operations

    40,284     59,770     (19,486 )

Discontinued operations

    2,391     1,529     862  

Gain on sales of real estate, net of income taxes

    2,829         2,829  
               

Net income

    45,504     61,299     (15,795 )

Net income attributable to noncontrolling interests

    (2,744 )   (4,970 )   2,226  

Preferred share dividends

    (16,102 )   (16,102 )    
               

Net income attributable to COPT common shareholders

  $ 26,658   $ 40,227   $ (13,569 )
               

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NOI from Continuing Real Estate Operations

 
  For the Years Ended December 31,  
 
  2010   2009   Variance  
 
  (Dollars in thousands)
 

Revenues

                   
 

Same Office Properties

  $ 401,498   $ 404,490   $ (2,992 )
 

Acquired properties

    29,935     4,150     25,785  
 

Constructed properties placed in service

    26,222     7,702     18,520  
 

Other

    2,145     7,642     (5,497 )
               

    459,800     423,984     35,816  
               

Property operating expenses

                   
 

Same Office Properties

    152,393     147,394     4,999  
 

Acquired properties

    11,880     1,153     10,727  
 

Constructed properties placed in service

    9,420     3,233     6,187  
 

Other

    5,726     5,374     352  
               

    179,419     157,154     22,265  
               

NOI from continuing real estate operations

                   
 

Same Office Properties

    249,105     257,096     (7,991 )
 

Acquired properties

    18,055     2,997     15,058  
 

Constructed properties placed in service

    16,802     4,469     12,333  
 

Other

    (3,581 )   2,268     (5,849 )
               

  $ 280,381   $ 266,830   $ 13,551  
               

        As the table above indicates, much of our change in NOI from continuing real estate operations was attributable to the additions of properties through acquisition and construction activities. In addition, the lines in the table entitled "Other" include the effects of vacancies in three properties that we expect to redevelop, including approximately 300,000 square feet at two properties in Greater Philadelphia; we experienced a $5.4 million decrease in NOI from continuing real estate operations attributable to these properties.

        With regard to changes in NOI from continuing real estate operations attributable to Same Office Properties:

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NOI from Service Operations

 
  For the Years Ended December 31,  
 
  2010   2009   Variance  
 
  (Dollars in thousands)
 

Construction contract and other service revenues

  $ 104,675   $ 343,087   $ (238,412 )

Construction contract and other service expenses

    102,302     336,519     (234,217 )
               

NOI from service operations

  $ 2,373   $ 6,568   $ (4,195 )
               

        NOI from service operations decreased due primarily to a lower volume of construction activity in connection with one large construction contract that was nearing completion. As evidenced in the changes set forth above, our volume of construction contract activity is inherently subject to significant variability depending on the volume and nature of projects undertaken by us (primarily on behalf of tenants). We view our service operations as an ancillary component of our overall operations that should generally be a small contributor to our operating income relative to our real estate operations.

Depreciation and Amortization Associated with Real Estate Operations

        Depreciation and amortization expense associated with real estate included in continuing operations increased due primarily to expense attributable to properties added into operations through acquisition and construction activities.

Interest Expense

        The table below sets forth the components of our interest expense included in continuing operations:

 
  For the Years Ended December 31,  
 
  2010   2009   Variance  
 
  (Dollars in thousands)
 

Interest on mortgage and other secured loans

  $ 82,634   $ 70,624   $ 12,010  

Interest on Exchangeable Senior Notes

    19,348     9,207     10,141  

Interest on Revolving Credit Facility

    5,661     6,040     (379 )

Interest expense recognized on interest rate swaps

    3,689     6,941     (3,252 )

Amortization of deferred financing costs

    5,871     4,214     1,657  

Other interest

    1,186     622     564  

Capitalized interest

    (16,524 )   (15,461 )   (1,063 )
               

Total

  $ 101,865   $ 82,187   $ 19,678  
               

The increase in interest expense included the effect of a $319.2 million increase in our average outstanding debt resulting from our financing of acquisition and construction activities. Also included was an increase in our weighted average interest rates of debt from 4.86% to 5.01%. The increase in the proportion of our interest expense attributable to Exchangeable Senior Notes resulted from our issuance of a $240.0 million aggregate principal amount of 4.25% Exchangeable Senior Notes in April 2010.

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Interest and Other Income

        Interest and other income increased due primarily to:

Gain on sales of real estate, net of income taxes

        The increase in gain on sales of real estate was attributable to the sale of a land parcel in Central New Jersey in 2010.

Net Income Attributable to Noncontrolling Interests

        Interests in our Operating Partnership are in the form of preferred and common units. The line entitled net income attributable to noncontrolling interests includes primarily income allocated to preferred and common units not owned by us. Income is allocated to noncontrolling preferred unitholders in an amount equal to the priority return from the Operating Partnership to which they are entitled. Income is allocated to noncontrolling common unitholders based on income earned by the Operating Partnership, after allocation to preferred unitholders, multiplied by the percentage of the common units in the Operating Partnership owned by those common unitholders.

        Net income attributable to noncontrolling interests decreased due primarily to: (1) a decrease in net income available to allocate to noncontrolling holders of common units in the Operating Partnership primarily resulting from the reasons set forth above; and (2) a decrease in the percentage of the Operating Partnership owned by noncontrolling interests resulting primarily from:

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Comparison of the Year Ended December 31, 2009 to the Year Ended December 31, 2008

 
  For the Years Ended December 31,  
 
  2009   2008   Variance  
 
  (Dollars in thousands)
 

Revenues

                   
 

Revenues from real estate operations

  $ 423,984   $ 396,760   $ 27,224  
 

Construction contract and other service revenues

    343,087     188,385     154,702  
               
   

Total revenues

    767,071     585,145     181,926  
               

Expenses

                   
 

Property operating expenses

    157,154     140,895     16,259  
 

Depreciation and amortization associated with real estate operations

    108,529     101,854     6,675  
 

Construction contract and other service expenses

    336,519     184,142     152,377  
 

General and administrative expense

    23,240     24,096     (856 )
 

Business development expenses

    3,699     1,233     2,466  
               
   

Total operating expenses

    629,141     452,220     176,921  
               

Operating income

    137,930     132,925     5,005  

Interest expense

    (82,187 )   (86,368 )   4,181  

Interest and other income

    5,164     2,070     3,094  

Gain on early extinguishment of debt

        8,101     (8,101 )

Equity in loss of unconsolidated entities

    (941 )   (147 )   (794 )

Income tax expense

    (196 )   (201 )   5  
               

Income from continuing operations

    59,770     56,380     3,390  

Discontinued operations

    1,529     3,832     (2,303 )

Gain on sales of real estate, net of income taxes

        1,104     (1,104 )
               

Net income

    61,299     61,316     (17 )

Net income attributable to noncontrolling interests

    (4,970 )   (7,351 )   2,381  

Preferred share dividends

    (16,102 )   (16,102 )    
               

Net income attributable to COPT common shareholders

  $ 40,227   $ 37,863   $ 2,364  
               

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NOI from Continuing Real Estate Operations

 
  For the Years Ended December 31,  
 
  2009   2008   Variance  
 
  (Dollars in thousands)
 

Revenues

                   
 

Same Office Properties

  $ 378,384   $ 367,450   $ 10,934  
 

Constructed properties placed in service

    29,293     17,465     11,828  
 

Acquired properties

    9,919     2,939     6,980  
 

Other

    6,388     8,906     (2,518 )
               

    423,984     396,760     27,224  
               

Property operating expenses

                   
 

Same Office Properties

    139,602     133,174     6,428  
 

Constructed properties placed in service

    9,680     5,021     4,659  
 

Acquired properties

    2,999     905     2,094  
 

Other

    4,873     1,795     3,078  
               

    157,154     140,895     16,259  
               

NOI from real estate operations

                   
 

Same Office Properties

    238,782     234,276     4,506  
 

Constructed properties placed in service

    19,613     12,444     7,169  
 

Acquired properties

    6,920     2,034     4,886  
 

Other

    1,515     7,111     (5,596 )
               

  $ 266,830   $ 255,865   $ 10,965  
               

        As the table above indicates, most of our increase in NOI from continuing real estate operations was attributable to the additions of properties through construction and acquisition activities. In addition, the lines in the table above entitled "Other" include the effects of approximately 500,000 square feet of vacancy at three properties in Greater Philadelphia (one was redeveloped and then placed into service in 2010 and two are expected to be redeveloped); we recognized a $3.4 million decrease in NOI from continuing real estate operations attributable to these properties.

        With regard to changes in NOI from continuing real estate operations attributable to Same Office Properties:

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NOI from Service Operations

 
  For the Years Ended December 31,  
 
  2009   2008   Variance  
 
  (Dollars in thousands)
 

Construction contract and other service revenues

  $ 343,087   $ 188,385   $ 154,702  

Construction contract and other service expenses

    336,519     184,142     152,377  
               

NOI from service operations

  $ 6,568   $ 4,243   $ 2,325  
               

        NOI from service operations increased due primarily to a high volume of construction activity in connection with one large construction contract.

Depreciation and Amortization Associated with Real Estate Operations

        Depreciation and amortization expense associated with real estate included in continuing operations increased due primarily to expense attributable to properties added into operations through construction and acquisition activities.

Interest Expense

        The table below sets forth the components of our interest expense included in continuing operations:

 
  For the Years Ended December 31,  
 
  2009   2008   Variance  
 
  (Dollars in thousands)
 

Interest on mortgage and other secured loans

  $ 70,624   $ 70,918   $ (294 )

Interest on Exchangeable Senior Notes

    9,207     10,866     (1,659 )

Interest on Revolving Credit Facility

    6,040     15,390     (9,350 )

Interest expense recognized on interest rate swaps

    6,941     3,120     3,821  

Amortization of deferred financing costs

    4,214     3,843     371  

Other interest

    622     543     79  

Capitalized interest

    (15,461 )   (18,312 )   2,851  
               

Total

  $ 82,187   $ 86,368   $ (4,181 )
               

Interest expense decreased primarily due to a decrease in the weighted average interest rates of debt from 5.2% to 4.9%. The events in the economy contributed towards significant reductions in interest rates on our variable debt from 2008 to 2009, including interest on our Revolving Credit Facility.

Gain on Early Extinguishment of Debt

        Gain on early extinguishment of debt recognized in 2008 was attributable to the repurchase in that year of a $37.5 million aggregate principal amount of our 3.5% Exchangeable Senior Notes for $26.7 million.

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Interest and Other Income

        Interest and other income increased due primarily to:

Discontinued Operations

        Discontinued operations decreased due primarily to gain from sales of real estate recognized in 2008. See Note 18 to the consolidated financial statements for a summary of the income components of discontinued operations.

Net Income Attributable to Noncontrolling Interests

        Net income attributable to noncontrolling interests decreased due primarily to a decrease in the percentage of the Operating Partnership owned by noncontrolling interests.

Earnings before Interest, Taxes, Depreciation and Amortization ("EBITDA") interest coverage ratio and EBITDA fixed charge coverage ratio

        EBITDA is net income adjusted for the effects of interest expense, depreciation and amortization and income taxes. We believe that EBITDA is a useful supplemental measure for assessing our un-levered performance. We believe that net income, as reported on our consolidated statements of operations, is the most directly comparable GAAP measure to EBITDA. EBITDA excludes items that are included in net income, including some that require cash outlays; we compensate for this limitation by using the measure simply as a supplemental measure that is considered alongside other GAAP and non-GAAP measures. It should not be used as an alternative to net income when evaluating our financial performance or to cash flow from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

        We use EBITDA to calculate EBITDA Interest Coverage Ratio and EBITDA Fixed Charge Coverage Ratio. We calculate EBITDA interest coverage by dividing EBITDA by interest expense on continuing and discontinued operations (excluding amortization of deferred financing costs and amortization of discounts on our Exchangeable Senior Notes, net of amounts capitalized). We calculate EBITDA fixed charge coverage ratio by dividing EBITDA by the sum of: (1) interest expense on continuing and discontinued operations (excluding amortization of deferred financing costs and amortization of discounts on our Exchangeable Senior Notes, net of amounts capitalized); (2) dividends on preferred shares; and (3) distributions on preferred units in the Operating Partnership not owned by us.

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        The tables below sets forth the computation of our EBITDA interest and fixed charge coverage ratios and reconciliations of EBITDA to net income reported on our consolidated statements of operations:

 
  For the Years Ended December 31,  
 
  2010   2009   2008  
 
  (dollars in thousands)
 

Net income

  $ 45,504   $ 61,299   $ 61,316  

Interest expense(1)

    102,128     82,420     86,921  

Income tax expense(2)

    119     196     779  

Depreciation and amortization

    125,819     111,811     104,968  
               

EBITDA

  $ 273,570   $ 255,726   $ 253,984  
               

Interest expense(1)

  $ 102,128   $ 82,420   $ 86,921  

Less: Amortization of deferred financing costs

    (5,871 )   (4,214 )   (3,843 )

Less: Amortization of discount on Exchangeable Senior Notes, net of amounts capitalized

    (5,314 )   (2,955 )   (3,225 )
               

Denominator for interest coverage

  $ 90,943   $ 75,251   $ 79,853  

Preferred share dividends

    16,102     16,102     16,102  

Preferred distributions

    660     660     660  
               

Denominator for fixed charge coverage

  $ 107,705   $ 92,013   $ 96,615  
               

EBITDA interest coverage ratio

    3.01x     3.40x     3.18x  

EBITDA fixed charge coverage ratio

    2.54x     2.78x     2.63x  

(1)
Includes interest from continuing operations and discontinued operations.

(2)
Includes income taxes from continuing operations, discontinued operations and gains on sales of real estate.

Funds From Operations

        Funds from operations ("FFO") is defined as net income computed using GAAP, excluding gains on sales of previously depreciated operating properties, plus real estate-related depreciation and amortization. Gains from sales of newly-developed properties less accumulated depreciation, if any, required under GAAP are included in FFO on the basis that development services are the primary revenue generating activity; we believe that inclusion of these development gains is in accordance with the National Association of Real Estate Investment Trusts ("NAREIT") definition of FFO, although others may interpret the definition differently and, accordingly, our presentation of FFO may differ from those of other REITs. We believe that FFO is useful to management and investors as a supplemental measure of operating performance because, by excluding gains related to sales of previously depreciated operating properties and excluding real estate-related depreciation and amortization, FFO can help one compare our operating performance between periods. In addition, since most equity REITs provide FFO information to the investment community, we believe that FFO is useful to investors as a supplemental measure for comparing our results to those of other equity REITs. We believe that net income is the most directly comparable GAAP measure to FFO.

        Since FFO excludes certain items includable in net income, reliance on the measure has limitations; management compensates for these limitations by using the measure simply as a supplemental measure that is weighed in the balance with other GAAP and non GAAP measures. FFO is not necessarily an indication of our cash flow available to fund cash needs. Additionally, it should not be used as an alternative to net income when evaluating our financial performance or to cash flow

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from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

        Basic FFO available to common share and common unit holders ("Basic FFO") is FFO adjusted to subtract (1) preferred share dividends, (2) income attributable to noncontrolling interests through ownership of preferred units in the Operating Partnership or interests in other consolidated entities not owned by us, (3) depreciation and amortization allocable to noncontrolling interests in other consolidated entities, (4) Basic FFO allocable to restricted shares and (5) issuance costs associated with redeemed preferred shares. With these adjustments, Basic FFO represents FFO available to common shareholders and common unitholders. Common units in the Operating Partnership are substantially similar to our common shares and are exchangeable into common shares, subject to certain conditions. We believe that Basic FFO is useful to investors due to the close correlation of common units to common shares. We believe that net income is the most directly comparable GAAP measure to Basic FFO. Basic FFO has essentially the same limitations as FFO; management compensates for these limitations in essentially the same manner as described above for FFO.

        Diluted FFO available to common share and common unit holders ("Diluted FFO") is Basic FFO adjusted to add back any changes in Basic FFO that would result from the assumed conversion of securities that are convertible or exchangeable into common shares. We believe that Diluted FFO is useful to investors because it is the numerator used to compute Diluted FFO per share, discussed below. We believe that the numerator for diluted EPS is the most directly comparable GAAP measure to Diluted FFO. Since Diluted FFO excludes certain items includable in the numerator to diluted EPS, reliance on the measure has limitations; management compensates for these limitations by using the measure simply as a supplemental measure that is weighed in the balance with other GAAP and non-GAAP measures. Diluted FFO is not necessarily an indication of our cash flow available to fund cash needs. Additionally, it should not be used as an alternative to net income when evaluating our financial performance or to cash flow from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

        Diluted FFO, excluding operating property acquisition costs and gain on early extinguishment of debt is defined as Diluted FFO adjusted to exclude these items. We believe that operating property acquisition costs and gain on early extinguishment of debt are not reflective of normal operations and, as a result, we believe that a measure that excludes these items is a useful supplemental measure in evaluating our operating performance. We believe that the numerator to diluted EPS is the most directly comparable GAAP measure to this non-GAAP measure. This measure has essentially the same limitations as Diluted FFO, as well as the further limitation of not reflecting the effects of the excluded items; we compensate for these limitations in essentially the same manner as described above for Diluted FFO.

        Diluted FFO per share is (1) Diluted FFO divided by (2) the sum of the (a) weighted average common shares outstanding during a period, (b) weighted average common units outstanding during a period and (c) weighted average number of potential additional common shares that would have been outstanding during a period if other securities that are convertible or exchangeable into common shares were converted or exchanged. We believe that Diluted FFO per share is useful to investors because it provides investors with a further context for evaluating our FFO results in the same manner that investors use earnings per share ("EPS") in evaluating net income available to common shareholders. In addition, since most equity REITs provide Diluted FFO per share information to the investment community, we believe that Diluted FFO per share is a useful supplemental measure for comparing us to other equity REITs. We believe that diluted EPS is the most directly comparable GAAP measure to Diluted FFO per share. Diluted FFO per share has most of the same limitations as Diluted FFO (described above); management compensates for these limitations in essentially the same manner as described above for Diluted FFO.

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        Diluted FFO per share, excluding operating property acquisition costs and gain on early extinguishment of debt is (1) Diluted FFO, excluding operating property acquisition costs and gain on early extinguishment of debt divided by (2) the sum of the (a) weighted average common shares outstanding during a period, (b) weighted average common units outstanding during a period and (c) weighted average number of potential additional common shares that would have been outstanding during a period if other securities that are convertible or exchangeable into common shares were converted or exchanged. We believe that this measure is useful to investors because it provides investors with a further context for evaluating our FFO results. We believe that diluted EPS is the most directly comparable GAAP measure to this per share measure. This measure has most of the same limitations as Diluted FFO (described above) as well as the further limitation of not reflecting the effects of the excluded items; we compensate for these limitations in essentially the same manner as described above for Diluted FFO.

        The computations for all of the above measures on a diluted basis assume the conversion of common units in our Operating Partnership but do not assume the conversion of other securities that are convertible into common shares if the conversion of those securities would increase per share measures in a given period.

        We use a measure called diluted FFO payout ratio, excluding operating property acquisition costs and gain on early extinguishment of debt as a supplemental measure of our ability to make distributions to investors. This measure is defined as (1) the sum of (a) dividends on common shares and (b) distributions to holders of interests in the Operating Partnership and dividends on convertible preferred shares when such distributions and dividends are included in Diluted FFO divided by (2) Diluted FFO, excluding operating property acquisition costs and gain on early extinguishment of debt.

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        The table below sets forth the computation of the above stated measures for the years ended December 31, 2006 through 2010 and provides reconciliations to the GAAP measures associated with such measures (dollars and shares in thousands, except per share data):

 
  For the Years Ended December 31,  
 
  2010   2009   2008   2007   2006  
 
  (Dollars and shares in thousands, except per share data)
 

Net income

  $ 45,504   $ 61,299   $ 61,316   $ 35,942   $ 55,988  

Add: Real estate-related depreciation and amortization

    123,243     109,386     102,772     106,260     78,631  

Add: Depreciation and amortization on unconsolidated real estate entities

    631     640     648     666     910  

Less: Gain on sales of previously depreciated operating properties, net of income taxes

    (1,077 )       (2,630 )   (3,827 )   (17,644 )
                       

FFO

    168,301     171,325     162,106     139,041     117,885  

Less: Noncontrolling interests-preferred units in the Operating Partnership

    (660 )   (660 )   (660 )   (660 )   (660 )

Less: Noncontrolling interests-other consolidated entities

    32     185     (172 )   122     136  

Less: Preferred share dividends

    (16,102 )   (16,102 )   (16,102 )   (16,068 )   (15,404 )

Less: Issuance costs associated with redeemed preferred shares

                    (3,896 )

Less: Depreciation and amortization allocable to noncontrolling interests in other consolidated entities

    (1,402 )   (493 )   (270 )   (188 )   (163 )

Less: Basic and Diluted FFO allocable to restricted shares

    (1,524 )   (1,629 )   (1,310 )   (876 )   (733 )
                       

Basic and Diluted FFO

  $ 148,645   $ 152,626   $ 143,592   $ 121,371   $ 97,165  

Operating property acquisition costs

    3,424     1,967              

Gain on early extinguishment of debt

            (8,101 )        

Gain on early extinguishment of debt allocable to restricted shares

            75          
                       

Diluted FFO, excluding operating property acquisition costs and gain on early extinguishment of debt

  $ 152,069   $ 154,593   $ 135,566   $ 121,371   $ 97,165  
                       

Weighted average common shares

    59,611     55,930     48,132     46,527     41,463  

Conversion of weighted average common units

    4,608     5,717     8,107     8,296     8,511  
                       

Weighted average common shares/units—Basic FFO

    64,219     61,647     56,239     54,823     49,974  

Dilutive effect of share-based compensation awards

    333     477     688     991     1,568  
                       

Weighted average common shares/units—Diluted FFO

    64,552     62,124     56,927     55,814     51,542  
                       

Diluted FFO per share

  $ 2.30   $ 2.46   $ 2.52   $ 2.17   $ 1.89  
                       

Diluted FFO per share, excluding operating property acquisition costs and gain on early extinguishment of debt

  $ 2.36   $ 2.49   $ 2.38   $ 2.17   $ 1.89  
                       

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  For the Years Ended December 31,  
 
  2010   2009   2008   2007   2006  
 
  (Dollars and shares in thousands, except per share data)
 

Numerator for diluted EPS

  $ 25,587   $ 39,217   $ 37,135   $ 15,616   $ 28,618  

Add: Income allocable to noncontrolling interests-common units in the Operating Partnership

    2,116     4,495     6,519     3,203     7,097  

Add: Real estate-related depreciation and amortization

    123,243     109,386     102,772     106,260     78,631  

Add: Depreciation and amortization of unconsolidated real estate entities

    631     640     648     666     910  

Add: Numerator for diluted EPS allocable to restricted shares

    1,071     1,010     728     517     449  

Less: Depreciation and amortization allocable to noncontrolling interests in other consolidated entities

    (1,402 )   (493 )   (270 )   (188 )   (163 )

Less: Basic and diluted FFO allocable to restricted shares

    (1,524 )   (1,629 )   (1,310 )   (876 )   (733 )

Less: Gain on sales of previously depreciated operating properties, net of income taxes

    (1,077 )       (2,630 )   (3,827 )   (17,644 )
                       

Basic and Diluted FFO

  $ 148,645   $ 152,626   $ 143,592   $ 121,371   $ 97,165  

Operating property acquisition costs

    3,424     1,967              

Gain on early extinguishment of debt

            (8,101 )        

Gain on early extinguishment of debt allocable to restricted shares

            75          
                       

Diluted FFO, excluding operating property acquisition costs and gain on early extinguishment of debt

  $ 152,069   $ 154,593   $ 135,566   $ 121,371   $ 97,165  
                       

Denominator for diluted EPS

    59,944     56,407     48,820     47,518     43,031  

Weighted average common units

    4,608     5,717     8,107     8,296     8,511  
                       

Denominator for diluted FFO per share measures

    64,552     62,124     56,927     55,814     51,542  
                       

Dividends on common shares

    98,510     87,596     70,836     61,331     49,670  

Common unit distributions

    7,266     7,962     11,510     10,682     9,996  
                       

Numerator for diluted FFO payout ratio, excluding operating property acquisition costs and gain on early extinguishment of debt

    105,776     95,558     82,346     72,013     59,666  
                       

Diluted FFO payout ratio, excluding operating property acquisition costs and gain on early extinguishment of debt

    69.6 %   61.8 %   60.7 %   59.3 %   61.4 %
                       

Investing and Financing Activities During 2010

        We acquired three operating office properties totaling 514,000 square feet that were 100% leased upon acquisition and a shell-complete office property totaling 183,000 square feet for $205.1 million. These acquisitions were financed primarily using an assumed $70.1 million mortgage loan having a fair

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value at assumption of $73.3 million with a stated fixed interest rate of 5.35% (effective interest rate of 3.95%) that matures in March 2014 and borrowings from our Revolving Credit Facility.

        We acquired a 233,000 square foot wholesale data center known as Power Loft @ Innovation in Manassas, Virginia, for $115.5 million on September 14, 2010. This property, the shell of which was completed in early 2010, was 17% leased on the date of acquisition to two tenants that have a combined initial critical load of three megawatts and further expansion rights of up to a combined five megawatts. We expect to complete the development of the property to an initial stabilization critical load of 18 megawatts for additional development costs initially estimated at $166 million. Full critical load of the property is expected to be up to 30 megawatts. This acquisition was financed primarily using borrowings from our Revolving Credit Facility.

        We placed into service an aggregate of 816,000 square feet in newly constructed space in nine office properties that were 77% leased at December 31, 2010; we expect all of these properties to be certified either LEED Silver or Gold. These properties included six properties totaling 803,000 square feet that became fully operational in 2010 (94,000 of these square feet were placed into service in 2009). Costs incurred on these fully operational properties through December 31, 2010 totaled $148.9 million, of which $13.1 million were incurred in 2010 that were financed using primarily borrowings from our Revolving Credit Facility and Revolving Construction Facility.

        In March 2010, we entered into a new submarket with the formation of LW Redstone Company, LLC, a joint venture created to develop Redstone Gateway, a 468-acre land parcel adjacent to Redstone Arsenal in Huntsville, Alabama. The land is owned by the U.S. Government and is under a long term master lease to the joint venture. Through this master lease, the joint venture will create a business park that we expect will total approximately 4.6 million square feet of office and retail space when completed, including approximately 4.4 million square feet of Class A office space. In addition, the business park will include hotel and other amenities. Development and construction of the business park is expected to take place over a 15 to 20-year period. Our joint venture partner does not have any funding obligations under the terms of the joint venture agreement.

        We also entered into an additional new submarket in 2010 by acquiring 15 acres on which we are entitled to develop up to 978,000 square feet in Springfield, Virginia. The property, which is known as Patriot Ridge, is located adjacent to the new 2.4 million square foot National Geospatial Intelligence Agency headquarters currently under construction at Fort Belvoir.

        The table below sets forth the major components of our additions to the line entitled "Total Properties, net" on our consolidated balance sheets for 2010 and 2009 (in thousands):

 
  For the Years Ended
December 31,
 
 
  2010   2009  

Construction, development and redevelopment

  $ 303,586   $ 181,986  

Acquisitions of operating properties

    187,052     119,249  

Tenant improvements on operating properties(1)

    23,781     13,497  

Capital improvements on operating properties

    10,991     16,269  
           

  $ 525,410   $ 331,001  
           

(1)
Tenant improvement costs incurred on newly-constructed properties are classified in this table as construction, development and redevelopment.

        On September 8, 2010, we sold two office properties in Dayton, New Jersey totaling 201,000 square feet for $20.9 million and recognized a gain of $780,000. We also sold on September 8, 2010 a land parcel that was contiguous to these properties for $3.0 million and recognized a gain of

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$2.5 million. The net proceeds from this sale after transaction costs totaled approximately $23.6 million, which we used primarily to repay our Revolving Credit Facility.

        On April 7, 2010, the Operating Partnership issued a $240.0 million aggregate principal amount of 4.25% Exchangeable Senior Notes due 2030. Interest on the notes is payable on April 15 and October 15 of each year. The notes have an exchange settlement feature that provides that the notes may, under certain circumstances, be exchangeable for cash and, at the Operating Partnership's discretion, our common shares at an exchange rate (subject to adjustment) of 20.7891 shares per $1,000 principal amount of the notes (exchange rate is as of December 31, 2010 and is equivalent to an exchange price of $48.10 per common share). The initial exchange rate of the notes was based on a 20% premium over the closing price on the NYSE on the transaction pricing date. On or after April 20, 2015, the Operating Partnership may redeem the notes in cash in whole or in part. The holders of the notes have the right to require us to repurchase the notes in cash in whole or in part on each of April 15, 2015, April 15, 2020 and April 15, 2025, or in the event of a "fundamental change," as defined under the terms of the notes, for a repurchase price equal to 100% of the principal amount of the notes plus accrued and unpaid interest. Prior to April 20, 2015, subject to certain exceptions, if (1) a "fundamental change" occurs as a result of certain forms of transactions or series of transactions and (2) a holder elects to exchange its notes in connection with such "fundamental change," we will increase the applicable exchange rate for the notes surrendered for exchange by a number of additional shares of our common shares as a "make whole premium." The notes are general unsecured senior obligations of the Operating Partnership and rank equally in right of payment with all other senior unsecured indebtedness of the Operating Partnership. The Operating Partnership's obligations under the notes are fully and unconditionally guaranteed by us. We used the $234.3 million in net proceeds available after transaction costs from this issuance for general corporate purposes, including the application of $224.0 million to pay down borrowings under our Revolving Credit Facility.

        In November 2010, we issued 7.5 million common shares at a public offering price of $34.25 per share, for net proceeds of $245.8 million after underwriting discounts but before offering expenses. The net proceeds were used to pay down our Revolving Credit Facility and for general corporate purposes.

        In 2010, we increased the capacity under our Revolving Credit Facility by $200.0 million, from $600.0 million to $800.0 million, by adding new lenders under the facility.

        During 2010, we entered into the following interest rate swap agreements, all of which are designated as hedges of interest payments on variable rate debt:

Cash Flows

        Our cash flow from operations decreased $38.4 million from 2009 to 2010 due primarily to the timing of cash flow associated with third-party construction projects and increased cash paid for interest. We expect to continue to use cash flow provided by operations as the primary source to meeting our short-term capital needs, including all property operating expenses, general and administrative expenses, interest expense, scheduled principal amortization of debt, dividends to our shareholders, distributions to our noncontrolling interest holders of preferred and common units in the Operating Partnership and capital improvements and leasing costs.

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        Our net cash flow used in investing activities increased $130.1 million from 2009 to 2010 due primarily to increased acquisition activity in 2010. Our cash flow provided by financing activities increased $168.8 million from 2009 to 2010 due primarily to a $173.1 million increase in net proceeds from our issuance of common shares.

Liquidity and Capital Resources

        Our primary cash requirements are for operating expenses, debt service, development of new properties, improvements to existing properties and acquisitions. While we may experience increasing challenges discussed elsewhere herein due to the current economic environment, we believe that our liquidity and capital resources are adequate for our near-term and longer-term requirements. We maintain sufficient cash and cash equivalents to meet our operating cash requirements and short term investing and financing cash requirements. When we determine that the amount of cash and cash equivalents on hand is more than we need to meet such requirements, we may pay down our Revolving Credit Facility or forgo borrowing under construction loan credit facilities to fund development activities.

        We rely primarily on fixed-rate, non-recourse mortgage loans from banks and institutional lenders to finance most of our operating properties. We have also made use of the public equity and debt markets to meet our capital needs, principally to repay or refinance corporate and property secured debt and to provide funds for project development and acquisitions.

        Our Revolving Credit Facility provides for borrowings of up to $800 million, $503.1 million of which was available at December 31, 2010; this facility is available through September 2011 and may be extended by one year at our option, provided that there is no default under the facility and we pay an extension fee of 0.125% of the total availability of the facility. In 2011, we expect to either create a new facility to replace the existing one or extend the maturity date of the existing facility by one year. We often use our Revolving Credit Facility initially to finance much of our investing activities. We then pay down the facility using proceeds generated from long-term borrowings and equity issuances. Amounts available under the facility are computed based on 65% of our unencumbered asset value, as defined in the agreement.

        In addition, we have a Revolving Construction Facility, which provides for borrowings of up to $225.0 million, $82.7 million of which was available at December 31, 2010 to fund future construction costs; this facility is available until May 2012, including a one-year extension obtained in January 2011.

        We expect to satisfy our 2011 debt maturities and fund the construction of properties under construction at year end or expected to be started in 2011 using capacity under our credit facilities and by accessing the secured debt market, unsecured debt market and/or public equity market. We are continually evaluating sources of capital and believe that there are satisfactory sources available to meet our capital requirements without necessitating property sales. However, selective dispositions of operating properties and other assets may provide capital resources in 2011 and in future years.

        Certain of our debt instruments require that we comply with a number of restrictive financial covenants, including maximum leverage ratio, unencumbered leverage ratio, minimum net worth, minimum fixed charge coverage, minimum unencumbered interest coverage ratio, minimum debt service and maximum secured indebtedness ratio. As of December 31, 2010, we were in compliance with these financial covenants.

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Contractual Obligations

        The following table summarizes our contractual obligations as of December 31, 2010 (in thousands):

 
  For the Years Ended December 31,    
 
Contractual obligations(1)
  2011   2012   2013   2014   2015   Thereafter   Total  

Debt(2)

                                           
 

Balloon payments due upon maturity

  $ 718,856   $ 257,523   $ 134,843   $ 202,697   $ 390,734   $ 575,265   $ 2,279,918  
 

Scheduled principal payments

    14,883     13,867     11,206     7,528     5,739     7,255     60,478  

Interest on debt(3)

    98,842     82,420     69,921     59,148     44,045     29,347     383,723  

New construction, development and redevelopment obligations(4)(5)

    69,920                 4,000         73,920  

Third-party construction and development obligations(5)(6)

    67,872                         67,872  

Capital expenditures for operating properties(5)(7)

    28,399                         28,399  

Operating leases(8)

    706     534     476     383     333     27,080     29,512  

Other purchase obligations(9)

    3,520     3,521     3,154     2,093     1,707     1,530     15,525  
                               

Total contractual cash obligations

  $ 1,002,998   $ 357,865   $ 219,600   $ 271,849   $ 446,558   $ 640,477   $ 2,939,347  
                               

(1)
The contractual obligations set forth in this table generally exclude individual contracts that had a value of less than $20,000. Also excluded are contracts associated with the operations of our properties that may be terminated with notice of one month or less, which is the arrangement that applies to most of our property operations contracts.

(2)
Represents scheduled principal amortization payments and maturities only and therefore excludes a net discount of $16.7 million. We expect to refinance the balloon payments that are due in 2011 and 2012 using primarily a combination of borrowings under our credit facilities and by accessing the secured debt market, unsecured debt market and/or public equity market. The principal maturities occurring in 2011 include $142.3 million that were extended to 2012 in January 2011 and an additional $311.8 million that may also be extended for one year, subject to certain conditions.

(3)
Represents interest costs for debt at December 31, 2010 for the terms of such debt. For variable rate debt, the amounts reflected above used December 31, 2010 interest rates on variable rate debt in computing interest costs for the terms of such debt.

(4)
Represents primarily contractual obligations pertaining to new construction, development and redevelopment activities. We expect to finance these costs using primarily a combination of borrowings under our credit facilities and by accessing the secured debt market, unsecured debt

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Activity
  Number of
Properties
  Square Feet
(in thousands)
or Critical Load
  Estimated Remaining Costs (in millions)   Expected Year For Costs to be Incurred Through  

Construction of new office properties

    10     1,041   $ 95.1     2012  

Development of new office properties

    9     1,326     293.4     2014  

Redevelopment of existing office properties

    4     873     42.5     2012  

Completion of wholesale data center

    1     18 MW     152.1     2012  
(5)
Because of the long-term nature of certain construction and development contracts, some of these costs will be incurred beyond 2011.

(6)
Represents contractual obligations pertaining to projects for which we are acting as construction manager on behalf of unrelated parties who are our clients. We expect to be reimbursed in full for these costs by our clients.

(7)
Represents contractual obligations pertaining to capital expenditures for our operating properties. We expect to finance all of these costs using cash flow from operations.

(8)
We expect to pay these items using cash flow from operations.

(9)
Primarily represents contractual obligations pertaining to managed-energy service contracts in place for certain of our operating properties. We expect to pay these items using cash flow from operations.

Off-Balance Sheet Arrangements

        During 2010, we owned an investment in an unconsolidated real estate joint venture accounted for using the equity method of accounting. This real estate joint venture was entered into in 2005 to enable us to contribute office properties that were previously wholly owned by us into the joint venture in order to partially dispose of our interest in the properties. We manage the real estate joint venture's property operations and any required construction projects. This real estate joint venture has a two-member management committee that is responsible for making major decisions (as defined in the joint venture agreement) and we control one of the management committee positions.

        We and our partner may receive returns in proportion to our investments in the joint venture. As part of our obligations under the joint venture arrangement, we entered into standard nonrecourse loan guarantees (environmental indemnifications and guarantees against fraud and misrepresentation, including springing guarantees of partnership debt in the event of a voluntary bankruptcy of the partnership). The maximum amount we could be required to pay under the guarantees is approximately $66 million. We are entitled to recover 20% of any amounts paid under the guarantees from an affiliate of the general partner pursuant to an indemnity agreement so long as we continue to manage the properties. In the event that we no longer manage the properties, the percentage that we are entitled to recover is increased to 80%. Management estimates that the aggregate fair value of the guarantees is not material and would not exceed the amounts included in distributions received in excess of investment in unconsolidated real estate joint venture reported on the consolidated balance sheets.

        We have distributions in excess of our investment in this unconsolidated real estate joint venture of $5.5 million at December 31, 2010 due to our not recognizing gain on the contribution of properties

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into the joint venture; we did not recognize a gain on the contribution since we have the contingent obligations described above. We recognized equity in the losses of this joint venture of $457,000 in 2010.

        We had no other material off-balance sheet arrangements during 2010.

Inflation

        Most of our tenants are obligated to pay their share of a building's operating expenses to the extent such expenses exceed amounts established in their leases, based on historical expense levels. Some of our tenants are obligated to pay their full share of a building's operating expenses. These arrangements somewhat reduce our exposure to increases in such costs resulting from inflation.

Recent Accounting Pronouncements

        We adopted amended guidance issued by the Financial Accounting Standards Board ("FASB") effective January 1, 2010 related to the accounting and disclosure requirements for the consolidation of VIEs. This guidance requires an enterprise to perform a qualitative analysis when determining whether or not it must consolidate a VIE based primarily on whether the entity (1) has the power to direct matters that most significantly impact the activities of the VIE and (2) has the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. The guidance also requires an enterprise to continuously reassess whether it must consolidate a VIE. Additionally, the standard requires enhanced disclosures about an enterprise's involvement with VIEs and any significant change in risk exposure due to that involvement, as well as how its involvement with VIEs impacts the enterprise's financial statements. As discussed further in Note 6 to the consolidated financial statements, the adoption of this guidance did not affect our financial position, results of operations or cash flows.

Item 7A.    Quantitative and Qualitative Disclosures about Market Risk

        We are exposed to certain market risks, the most predominant of which is change in interest rates. Increases in interest rates can result in increased interest expense under our Revolving Credit Facility and other variable rate debt. Increases in interest rates can also result in increased interest expense when our fixed rate debt matures and needs to be refinanced. Our capital strategy favors long-term, fixed-rate, secured debt over variable-rate debt to minimize the risk of short-term increases in interest rates.

        The following table sets forth as of December 31, 2010 our debt obligations and weighted average interest rates for fixed rate debt by expected maturity date (dollars in thousands):

 
  For the Years Ending December 31,    
 
 
  2011(1)   2012   2013   2014   2015   Thereafter   Total  

Long term debt:

                                           
 

Fixed rate(2)

  $ 278,361   $ 48,647   $ 144,616   $ 162,009   $ 359,596   $ 582,520   $ 1,575,749  
 

Weighted average interest rate

    4.35 %   6.36 %   5.62 %   6.40 %   4.72 %   6.02 %   5.44 %
 

Variable rate

  $ 455,378   $ 222,743   $ 1,433   $ 48,216   $ 36,877   $   $ 764,647  

(1)
Includes $142.3 million in maturities that were extended to 2012 in January 2011 and an additional $311.8 million that may also be extended for one year, subject to certain conditions.

(2)
Represents principal maturities only and therefore excludes net discounts of $16.7 million.

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        The fair market value of our debt was $2.3 billion at December 31, 2010 and $2.0 billion at December 31, 2009. If interest rates had been 1% lower, the fair value of our fixed-rate debt would have increased by $65.8 million at December 31, 2010 and $62.6 million at December 31, 2009.

        The following table sets forth information pertaining to our interest rate swap contracts in place as of December 31, 2010 and 2009 and their respective fair values (dollars in thousands):

 
   
   
   
  Fair Value at
December 31,
 
 
  One-Month LIBOR Base    
   
 
Notional
Amount
  Effective Date   Expiration Date   2010   2009  
$ 120,000     1.7600 %   1/2/2009     5/1/2012   $ (2,062 ) $ (669 )
  100,000     1.9750 %   1/1/2010     5/1/2012     (2,002 )   (1,068 )
  50,000     0.5025 %   1/3/2011     1/3/2012     (64 )    
  50,000     0.5025 %   1/3/2011     1/3/2012     (64 )    
  50,000     0.4400 %   1/4/2011     1/3/2012     (34 )    
  40,000 (1)   3.8300 %   11/2/2010     11/2/2015     644      
                               
                        $ (3,582 ) $ (1,737 )
                               

(1)
The notional amount of this instrument is scheduled to amortize to $36.2 million.

        Based on our variable-rate debt balances, including the effect of interest rate swap contracts, our interest expense would have increased by $2.5 million in 2010 and $4.1 million in 2009 if short-term interest rates were 1% higher.

Item 8.    Financial Statements and Supplementary Data

        This item is included in a separate section at the end of this report beginning on page F-1.

Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

        None.

Item 9A.    Controls and Procedures

        Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) as of December 31, 2010. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of December 31, 2010 were functioning effectively to provide reasonable assurance that the information required to be disclosed by us in reports filed or submitted under the Securities Exchange Act of 1934 is (i) recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and (ii) accumulated and communicated to our management, including our principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

II.
Internal Control Over Financial Reporting

(a)
Management's Annual Report on Internal Control Over Financial Reporting

        Management's Annual Report on Internal Control Over Financial Reporting is included in a separate section at the end of this report on page F-2.

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(b)
Report of Independent Registered Public Accounting Firm

        The Report of Independent Registered Public Accounting Firm is included in a separate section at the end of this report on page F-3.

(c)
Change in Internal Control over Financial Reporting

        No change in our internal control over financial reporting occurred during the most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 9B.    Other Information

        None.

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PART III

        Items 10, 11, 12, 13 & 14. Directors, Executive Officers and Corporate Governance; Executive Compensation; Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters; Certain Relationships and Related Transactions, and Director Independence; and Principal Accountant Fees and Services

        For the information required by Item 10, Item 11, Item 12, Item 13 and Item 14, you should refer to our definitive proxy statement relating to the 2011 Annual Meeting of our Shareholders to be filed with the Securities and Exchange Commission no later than 120 days after the end of the fiscal year covered by this Form 10-K.


PART IV

Item 15.    Exhibits and Financial Statement Schedules

(a)
The following documents are filed as exhibits to this Form 10-K:

1.
Financial Statements.    See "Index to consolidated financial statements" on page F-1 of this Form 10-K.

2.
Financial Statement Schedule.    See "Index to consolidated financial statements" on page F-1 of this Form 10-K.

3.
See section below entitled "Exhibits."

(b)
Exhibits.    Refer to the Exhibit Index that follows. Unless otherwise noted, the file number of all documents incorporated by reference is 1-14023.

EXHIBIT
NO.
  DESCRIPTION
  3.1.1   Amended and Restated Declaration of Trust of Registrant (filed with the Registrant's Registration Statement on Form S-4 (Commission File No. 333-45649) and incorporated herein by reference).

 

3.1.2

 

Articles of Amendment of Amended and Restated Declaration of Trust (filed on March 22, 2002 with the Company's Annual Report on Form 10-K for the year ended December 31, 2001 and incorporated herein by reference).

 

3.1.3

 

Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company's Current Report on Form 8-K on December 29, 2004 and incorporated herein by reference).

 

3.1.4

 

Articles Supplementary of Corporate Office Properties Trust Series B Cumulative Redeemable Preferred Shares, dated July 2, 1999 (filed with the Company's Current Report on Form 8-K on July 7, 1999 and incorporated herein by reference).

 

3.1.5

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series B Cumulative Redeemable Preferred Shares (filed with the Company's Current Report on Form 8-K on December 29, 2004 and incorporated herein by reference).

 

3.1.6

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series D Convertible Preferred Shares (filed with the Company's Current Report on Form 8-K on December 29, 2004 and incorporated herein by reference).

 

3.1.7

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series E Cumulative Redeemable Preferred Shares, dated April 3, 2001 (filed with the Registrant's Current Report on Form 8-K on April 4, 2001 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  3.1.8   Articles Supplementary of Corporate Office Properties Trust relating to the Series F Cumulative Redeemable Preferred Shares, dated September 13, 2001 (filed with the Registrant's Amended Current Report on Form 8-K on September 14, 2001 and incorporated herein by reference).

 

3.1.9

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series G Cumulative Redeemable Preferred Shares, dated August 6, 2003 (filed with the Registrant's Registration Statement on Form 8-A on August 7, 2003 and incorporated herein by reference).

 

3.1.10

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series H Cumulative Redeemable Preferred Shares, dated December 11, 2003 (filed with the Current Report on Form 8-K on December 12, 2003 and incorporated herein by reference).

 

3.1.11

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series J Cumulative Redeemable Preferred Shares of Beneficial Interest (filed with the Company's Current Report on Form 8-K dated July 19, 2006 and incorporated herein by reference).

 

3.1.12

 

Articles Supplementary of Corporate Office Properties Trust relating to the Series K Cumulative Redeemable Convertible Preferred Shares of Beneficial Interest (filed with the Company's Current Report on Form 8-K dated January 16, 2007 and incorporated herein by reference).

 

3.1.13

 

Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company's Current Report on Form 8-K dated May 28, 2008 and incorporated herein by reference).

 

3.1.14

 

Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company's Current Report on Form 8-K dated May 19, 2010 and incorporated herein by reference).

 

3.2

 

Bylaws of the Registrant, as amended and restated on December 3, 2009 (filed with the Company's Current Report on Form 8-K dated December 9, 2009 and incorporated herein by reference).

 

3.3

 

Form of certificate for the Registrant's Common Shares of Beneficial Interest, $0.01 par value per share (filed with the Registrant's Registration Statement on Form S-4 (Commission File No. 333-45649) and incorporated herein by reference).

 

4.1

 

Indenture, dated as of September 18, 2006, among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and Wells Fargo Bank, National Association, as trustee (filed with the Company's Current Report on Form 8-K dated September 22, 2006 and incorporated herein by reference).

 

4.2

 

3.50% Exchangeable Senior Note due 2026 of Corporate Office Properties, L.P. (filed with the Company's Current Report on Form 8-K dated September 22, 2006 and incorporated herein by reference).

 

4.3

 

Indenture, dated as of April 7, 2010, among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and Wells Fargo Bank, National Association, as trustee (filed with the Company's Current Report on Form 8-K dated April 16, 2010 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  4.4   4.25% Exchangeable Senior Note due 2030 of Corporate Office Properties, L.P. (filed with the Company's Current Report on Form 8-K dated April 16, 2010 and incorporated herein by reference).

 

10.1.1

 

Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 7, 1999 (filed on March 16, 2000 with the Company's Annual Report on Form 10-K for the year ended December 31, 1999 and incorporated herein by reference).

 

10.1.2

 

First Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 21, 1999 (filed on March 16, 2000 with the Company's Annual Report on Form 10-K for the year ended December 31, 1999 and incorporated herein by reference).

 

10.1.3

 

Second Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 21, 1999 (filed with the Company's Post Effective Amendment No. 2 to Form S-3 dated November 1, 2000 (Registration Statement No. 333-71807) and incorporated herein by reference).

 

10.1.4

 

Third Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated September 29, 2000 (filed with the Company's Post Effective Amendment No. 2 to Form S-3 dated November 1, 2000 (Registration Statement No. 333-71807) and incorporated herein by reference).

 

10.1.5

 

Fourth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated November 27, 2000 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.1.6

 

Fifth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated January 25, 2001 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.1.7

 

Sixth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated April 3, 2001 (filed with the Company's Current Report on Form 8-K dated April 4, 2001 and incorporated herein by reference).

 

10.1.8

 

Seventh Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated August 30, 2001 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.1.9

 

Eighth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated September 14, 2001 (filed with the Company's Amended Current Report on Form 8-K dated September 14, 2001 and incorporated herein by reference).

 

10.1.10

 

Ninth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated October 6, 2001 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  10.1.11   Tenth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 29, 2001 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.1.12

 

Eleventh Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 15, 2002 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.1.13

 

Twelfth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated June 2, 2003 (filed on August 12, 2003 with the Registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2003 and incorporated herein by reference).

 

10.1.14

 

Thirteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated August 11, 2003 (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.1.15

 

Fourteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated December 18, 2003 (filed on March 11, 2004 with the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).

 

10.1.16

 

Fifteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated January 31, 2004 (filed on March 11, 2004 with the Company's Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).

 

10.1.17

 

Sixteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 15, 2004 (filed on May 7, 2004 with the Company's Form 10-Q for the quarter ended March 31, 2004 and incorporated herein by reference).

 

10.1.18

 

Seventeenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated September 23, 2004 (filed with the Company's Current Report on Form 8-K dated September 23, 2004 and incorporated herein by reference).

 

10.1.19

 

Eighteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 18, 2005 (filed with the Company's Form 8-K on April 22, 2005 and incorporated herein by reference).

 

10.1.20

 

Nineteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated July 8, 2005 (filed with the Company's Current Report on Form 8-K on July 14, 2005 and incorporated herein by reference).

 

10.1.21

 

Twentieth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated June 29, 2006 (filed with the Company's Current Report on Form 8-K dated July 6, 2006 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  10.1.22   Twenty-First Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated July 20, 2006 (filed with the Company's Current Report on Form 8-K dated July 26, 2006 and incorporated herein by reference).

 

10.1.23

 

Twenty-Second Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated January 9, 2007 (filed with the Company's Current Report on Form 8-K dated January 16, 2007 and incorporated herein by reference).

 

10.1.24

 

Twenty-Third Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 6, 2007 (filed with the Company's Current Report on Form 8-K dated April 12, 2007 and incorporated herein by reference).

 

10.1.25

 

Twenty-Fourth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated November 2, 2007 (filed with the Company's Current Report on Form 8-K dated November 5, 2007 and incorporated herein by reference).

 

10.1.26

 

Twenty-Fifth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated December 31, 2008 (filed with the Company's Current Report on Form 8-K dated January 5, 2009 and incorporated herein by reference).

 

10.1.27

 

Twenty-Sixth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated March 4, 2010 (filed with the Company's Current Report on Form 8-K dated March 10, 2010 and incorporated herein by reference).

 

10.2

 

Stock Option Plan for Directors (filed with Royale Investments, Inc.'s Form 10-KSB for the year ended December 31, 1993 (Commission File No. 0-20047) and incorporated herein by reference).

 

10.3.1

*

Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed with the Registrant's Registration Statement on Form S-4 (Commission File No. 333-45649) and incorporated herein by reference).

 

10.3.2

*

Amendment No. 1 to Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed on August 13, 1999 with the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 1999 and incorporated herein by reference).

 

10.3.3

*

Amendment No. 2 to Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed on March 22, 2002 with the Company's Annual Report on Form 10-K for the year ended December 31, 2001 and incorporated herein by reference).

 

10.4

*

Corporate Office Properties Trust Supplemental Nonqualified Deferred Compensation Plan (filed with the Registrant's Registration Statement on Form S-8 (Commission File No. 333-87384) and incorporated herein by reference).

 

10.5.1

*

Employment Agreement, dated July 13, 2005, between Corporate Office Properties, L.P. Corporate Office Properties Trust and Randall M. Griffin (filed with the Company's Current Report on Form 8-K dated July 19, 2005 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  10.5.2 * Amendment to Employment Agreement, dated May 30, 2006, between Corporate Office Properties, L.P., Corporate Office Properties Trust and Randall M. Griffin (filed with the Company's Current Report on Form 8-K dated June 1, 2006 and incorporated herein by reference).

 

10.5.3

*

Second Amendment to Employment Agreement, dated December 31, 2008, between Corporate Office Properties, L.P., Corporate Office Properties Trust and Randall M. Griffin (filed with the Company's Current Report on Form 8-K dated January 5, 2009 and incorporated herein by reference).

 

10.5.4

*

Third Amendment to Employment Agreement, dated September 16, 2010, between Corporate Office Properties, L.P., Corporate Office Properties Trust and Randall M. Griffin (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.6.1

*

Employment Agreement, dated September 12, 2002, between the Operating Partnership, COPT and Roger A. Waesche, Jr. (filed on March 27, 2003 with the Company's Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).

 

10.6.2

*

Amendment to Employment Agreement, dated March 4, 2005, between the Operating Partnership, COPT and Roger A. Waesche, Jr. (filed on March 16, 2005 with the Company's Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).

 

10.6.3

*

Second Amendment to Employment Agreement, dated May 30, 2006, between Corporate Office Properties, L.P., Corporate Office Properties Trust, and Roger A. Waesche, Jr. (filed with the Company's Current Report on Form 8-K dated June 1, 2006 and incorporated herein by reference).

 

10.6.4

*

Third Amendment to Employment Agreement, dated July 31, 2006, between Corporate Office Properties, L.P., Corporate Office Properties Trust, and Roger A. Waesche, Jr. (filed with the Company's Current Report on Form 8-K dated August 1, 2006 and incorporated herein by reference).

 

10.6.5

*

Fourth Amendment to Employment Agreement, dated March 2, 2007, between Corporate Office Properties, L.P., Corporate Office Properties Trust, and Roger A. Waesche, Jr. (filed with the Company's Annual Report on Form 10-K dated February 29, 2008 and incorporated herein by reference).

 

10.6.6

*

Fifth Amendment to Employment Agreement, dated September 16, 2010, between Corporate Office Properties, L.P., Corporate Office Properties Trust, and Roger A. Waesche, Jr. (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.7.1

*

Employment Agreement, dated May 15, 2003, between Corporate Development Services, LLC, Corporate Office Properties Trust and Dwight Taylor (filed on August 12, 2003 with the Registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2003 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  10.7.2 * Amendment to Employment Agreement, dated March 4, 2005, between Corporate Development Services, LLC, Corporate Office Properties Trust and Dwight Taylor (filed on March 16, 2005 with the Company's Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).

 

10.7.3

*

Second Amendment to Employment Agreement, dated March 2, 2007, between Corporate Development Services, LLC, Corporate Office Properties Trust and Dwight S. Taylor (filed with the Company's Annual Report on Form 10-K dated February 29, 2008 and incorporated herein by reference).

 

10.8

*

Employment Agreement, dated November 28, 2005, between Corporate Office Properties, L.P. Corporate Office Properties Trust and Karen M. Singer (filed with the Company's Current Report on Form 8-K on December 1, 2005 and incorporated herein by reference).

 

10.9.1

*

Employment Agreement, dated July 31, 2006, between Corporate Office Properties, L.P., Corporate Office Properties Trust and Stephen E. Riffee (filed with the Company's Current Report on Form 8-K dated August 1, 2006 and incorporated herein by reference).

 

10.9.2

*

First Amendment to Employment Agreement, dated December 31, 2008, between Corporate Office Properties, L.P., Corporate Office Properties Trust and Stephen E. Riffee (filed with the Company's Current Report on Form 8-K dated January 5, 2009 and incorporated herein by reference).

 

10.9.3

*

Second Amendment to Employment Agreement, dated September 16, 2010, between Corporate Office Properties, L.P., Corporate Office Properties Trust and Stephen E. Riffee (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.10.1

*

Employment Agreement, dated December 31, 2008, between Corporate Development Services, LLC, Corporate Office Properties Trust and Wayne Lingafelter (filed with the Company's Annual Report on Form 8-K dated January 5, 2009 and incorporated herein by reference).

 

10.10.2

*

First Amendment to Employment Agreement, dated September 16, 2010, between Corporate Development Services, LLC, Corporate Office Properties Trust and Wayne Lingafelter (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.11

 

Promissory Note, dated October 22, 1998, between Teachers Insurance and Annuity Association of America and the Operating Partnership (filed on November 13, 1998 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 1998 and incorporated herein by reference).

 

10.12

 

Indemnity Deed of Trust, Assignment of Leases and Rents and Security Agreement, dated October 22, 1998, by affiliates of the Operating Partnership for the benefit of Teachers Insurance and Annuity Association of America (filed on November 13, 1998 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 1998 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  10.13   Promissory Note, dated September 30, 1999, between Teachers Insurance and Annuity Association of America and the Operating Partnership (filed on November 8, 1999 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 1999 and incorporated herein by reference).

 

10.14

 

Indemnity Deed of Trust, Assignment of Leases and Rents and Security Agreement, dated September 30, 1999, by affiliates of the Operating Partnership for the benefit of Teachers Insurance and Annuity Association of America (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.15

 

Amended and Restated Registration Rights Agreement, dated March 16, 1998, for the benefit of certain shareholders of the Company (filed on August 12, 1998 with the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 1998 and incorporated herein by reference).

 

10.16

 

Registration Rights Agreement, dated January 25, 2001, for the benefit of Barony Trust Limited (filed on March 22, 2001 with the Company's Annual Report on Form 10-K for the year ended December 31, 2000 and incorporated herein by reference).

 

10.17

 

Registration Rights Agreement, dated September 18, 2006, among Corporate Office Properties, L.P., Corporate Office Properties Trust, Banc of America Securities LLC and J.P. Morgan Securities Inc. (filed with the Company's Current Report on Form 8-K dated September 22, 2006 and incorporated herein by reference).

 

10.18

 

Option Agreement, dated March 1998, between the Operating Partnership and Blue Bell Land, L.P. (filed on March 16, 2000 with the Company's Annual Report on Form 10-K for the year ended December 31, 1999 and incorporated herein by reference).

 

10.19

 

Second Amended and Restated Credit Agreement, dated October 1, 2007, among Corporate Office Properties, L.P.; Corporate Office Properties Trust; KeyBanc Capital Markets; Wachovia Capital Markets, LLC; KeyBank National Association; Wachovia Bank, National Association; Bank of America, N.A.; Manufacturers and Traders Trust Company; and Citizens Bank of Pennsylvania (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.20

*

Retirement and Consulting Agreement, dated April 12, 2005, between Corporate Office Properties, L.P. and Clay W. Hamlin, III (filed with the Company's Form 8-K on April 15, 2005 and incorporated herein by reference).

 

10.21.1

*

Corporate Office Properties Trust Supplemental Nonqualified Deferred Compensation Plan (filed with the Company's Current Report on Form 8-K dated December 10, 2008 and incorporated herein by reference).

 

10.21.2

*

First Amendment to the Corporate Office Properties Trust Supplemental Nonqualified Deferred Compensation Plan dated December 4, 2008 (filed with the Company's Current Report on Form 8-K dated December 10, 2008 and incorporated herein by reference).

 

10.22

 

Common Stock Delivery Agreement dated as of September 18, 2006, between Corporate Office Properties, L.P. and Corporate Office Properties Trust (filed with the Company's Current Report on Form 8-K dated September 22, 2006 and incorporated herein by reference).

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EXHIBIT
NO.
  DESCRIPTION
  10.23   Purchase Agreement and Agreement and Plan of Merger, dated December 21, 2006, by and among the Corporate Office Properties Trust; Corporate Office Properties, L.P.; W&M Business Trust; and Nottingham Village,  Inc. (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.24

 

Purchase and Sale Agreement of Ownership Interests, dated December 21, 2006, by and between Corporate Office Properties, L.P. and Nottingham Properties, Inc. (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.25

 

Construction Loan Agreement dated as of May 2, 2008 by and among Corporate Office Properties, L.P., as borrower, Corporate Office Properties Trust, as parent, Keybanc Capital Markets, Inc. as arranger, Keybank National Association, as administrative agent, Bank of America, N.A., as syndication agent, Manufacturers and Traders Trust Company, as documentation agent, and the financial institutions initially signatory thereto and their assignees pursuant to Section 12.5 thereof, as lenders (filed on October 29, 2010 with the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and incorporated herein by reference).

 

10.26.1

*

Corporate Office Properties Trust 2008 Omnibus Equity and Incentive Plan (included in Appendix A to the Company's Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on April 9, 2008 and incorporated herein by reference).

 

10.26.2

*

Corporate Office Properties Trust Amended and Restated 2008 Omnibus Equity and Incentive Plan (included in Annex A to the Company's Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 30, 2010 and incorporated herein by reference).

 

10.27

 

Registration Rights Agreement, dated April 7, 2010, among Corporate Office Properties, L.P., Corporate Office Properties Trust, J.P. Morgan Securities Inc. and RBC Capital Markets Corporation (filed with the Company's Current Report on Form 8-K dated April 16, 2010 and incorporated herein by reference).

 

10.28

 

Common Stock Delivery Agreement, dated April 7, 2010, among Corporate Office Properties, L.P. and Corporate Office Properties Trust (filed with the Company's Current Report on Form 8-K dated April 16, 2010 and incorporated herein by reference).

 

12.1

 

Statement regarding Computation of Earnings to Combined Fixed Charges and Preferred Share Dividends (filed herewith).

 

21.1

 

Subsidiaries of Registrant (filed herewith).

 

23.1

 

Consent of Independent Registered Public Accounting Firm (filed herewith).

 

31.1

 

Certification of the Chief Executive Officer of Corporate Office Properties Trust required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended (filed herewith).

 

31.2

 

Certification of the Chief Financial Officer of Corporate Office Properties Trust required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended (filed herewith).

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EXHIBIT
NO.
  DESCRIPTION
  32.1   Certification of the Chief Executive Officer of Corporate Office Properties Trust required by Rule 13a-14(b) under the Securities Exchange Act of 1934, as amended. (This exhibit shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Further, this exhibit shall not be deemed to be incorporated by reference into any filing under the Securities Exchange Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.) (Furnished herewith.)

 

32.2

 

Certification of the Chief Financial Officer of Corporate Office Properties Trust required by Rule 13a-14(b) under the Securities Exchange Act of 1934, as amended. (This exhibit shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Further, this exhibit shall not be deemed to be incorporated by reference into any filing under the Securities Exchange Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.) (Furnished herewith.)

 

101.INS

 

XBRL Instance Document (furnished herewith).

 

101.SCH

 

XBRL Taxonomy Extension Schema Document (furnished herewith).

 

101.CAL

 

XBRL Taxonomy Extension Calculation Linkbase Document (furnished herewith).

 

101.LAB

 

XBRL Extension Labels Linkbase (furnished herewith).

 

101.PRE

 

XBRL Taxonomy Extension Presentation Linkbase Document (furnished herewith).

 

101.DEF

 

XBRL Taxonomy Extension Definition Linkbase Document (furnished herewith).

*
—Indicates a compensatory plan or arrangement required to be filed as an exhibit to this Form 10-K.

(c)   Not applicable.

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SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

    CORPORATE OFFICE PROPERTIES TRUST

Date: February 11, 2011

 

By:

 

/s/ RANDALL M. GRIFFIN

Randall M. Griffin
Chief Executive Officer

Date: February 11, 2011

 

By:

 

/s/ STEPHEN E. RIFFEE

Stephen E. Riffee
Executive Vice President and
Chief Financial Officer

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        Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated:

Signatures
 
Title
 
Date

 

 

 

 

 
/s/ JAY H. SHIDLER

(Jay H. Shidler)
  Chairman of the Board and Trustee   February 11, 2011

/s/ CLAY W. HAMLIN, III

(Clay W. Hamlin, III)

 

Vice Chairman of the Board
and Trustee

 

February 11, 2011

/s/ RANDALL M. GRIFFIN

(Randall M. Griffin)

 

Chief Executive Officer and Trustee

 

February 11, 2011

/s/ STEPHEN E. RIFFEE

(Stephen E. Riffee)

 

Executive Vice President and
Chief Financial Officer
(Principal Financial Officer)

 

February 11, 2011

/s/ GREGORY J. THOR

(Gregory J. Thor)

 

Vice President and Controller
(Principal Accounting Officer)

 

February 11, 2011

/s/ THOMAS F. BRADY

(Thomas F. Brady)

 

Trustee

 

February 11, 2011

/s/ ROBERT L. DENTON

(Robert L. Denton)

 

Trustee

 

February 11, 2011

/s/ DAVID M. JACOBSTEIN

(David M. Jacobstein)

 

Trustee

 

February 11, 2011

/s/ STEVEN D. KESLER

(Steven D. Kesler)

 

Trustee

 

February 11, 2011

/s/ KENNETH S. SWEET, JR.

(Kenneth S. Sweet, Jr.)

 

Trustee

 

February 11, 2011

/s/ RICHARD SZAFRANSKI

(Richard Szafranski)

 

Trustee

 

February 11, 2011

/s/ KENNETH D. WETHE

(Kenneth D. Wethe)

 

Trustee

 

February 11, 2011

88


Table of Contents

CORPORATE OFFICE PROPERTIES TRUST AND SUBSIDIARIES
INDEX TO FINANCIAL STATEMENTS

CONSOLIDATED FINANCIAL STATEMENTS

   
 

Management's Report of Internal Control Over Financial Reporting

 
F-2
 

Report of Independent Registered Public Accounting Firm

  F-3
 

Consolidated Balance Sheets as of December 31, 2010 and 2009

  F-4
 

Consolidated Statements of Operations for the Years Ended December 31, 2010, 2009 and 2008

  F-5
 

Consolidated Statements of Equity for the Years Ended December 31, 2010, 2009 and 2008

  F-6
 

Consolidated Statements of Cash Flows for the Years Ended December 31, 2010, 2009 and 2008

  F-7
 

Notes to Consolidated Financial Statements

  F-9

FINANCIAL STATEMENT SCHEDULE

   

Schedule III—Real Estate and Accumulated Depreciation as of December 31, 2010

 
F-56

F-1


Table of Contents


Management's Report On Internal Control Over Financial Reporting

        Management is responsible for establishing and maintaining adequate internal control over financial reporting, and for performing an assessment of the effectiveness of internal control over financial reporting as of December 31, 2010. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Our internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and trustees; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

        Management performed an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2010 based upon criteria in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission ("COSO"). Based on our assessment, management determined that our internal control over financial reporting was effective as of December 31, 2010 based on the criteria in Internal Control—Integrated Framework issued by the COSO.

        The effectiveness of the Company's internal control over financial reporting as of December 31, 2010 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

F-2


Table of Contents


Report of Independent Registered Public Accounting Firm

To the Board of Trustees and Shareholders of Corporate Office Properties Trust:

        In our opinion, the consolidated financial statements listed in the accompanying index 15(a)(1) present fairly, in all material respects, the financial position of Corporate Office Properties Trust and its subsidiaries at December 31, 2010 and December 31, 2009, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2010 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index 15(a)(2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2010, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company's management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying "Management's Report on Internal Control over Financial Reporting". Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Company's internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

        A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

        Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Baltimore, MD
February 11, 2011

F-3


Table of Contents


Corporate Office Properties Trust and Subsidiaries

Consolidated Balance Sheets

(Dollars in thousands)

 
  December 31,  
 
  2010   2009  

Assets

             

Properties, net:

             
 

Operating properties, net

  $ 2,802,773   $ 2,510,277  
 

Properties held for sale, net

        18,533  
 

Projects under construction or development

    642,682     501,090  
           
 

Total properties, net

    3,445,455     3,029,900  

Cash and cash equivalents

    10,102     8,262  

Restricted cash and marketable securities

    22,582     16,549  

Accounts receivable (net of allowance for doubtful accounts of $2,796 and $2,516, respectively)

    18,938     17,459  

Deferred rent receivable

    79,160     71,805  

Intangible assets on real estate acquisitions, net

    113,735     100,671  

Deferred leasing and financing costs, net

    60,649     51,570  

Prepaid expenses and other assets

    93,896     83,806  
           

Total assets

  $ 3,844,517   $ 3,380,022  
           

Liabilities and equity

             

Liabilities:

             
 

Debt, net

  $ 2,323,681   $ 2,053,841  
 

Accounts payable and accrued expenses

    99,699     116,455  
 

Rents received in advance and security deposits

    31,603     32,177  
 

Dividends and distributions payable

    32,986     28,440  
 

Deferred revenue associated with operating leases

    14,802     14,938  
 

Distributions in excess of investment in unconsolidated real estate joint venture

    5,545     5,088  
 

Other liabilities

    13,063     8,451  
           

Total liabilities

    2,521,379     2,259,390  
           

Commitments and contingencies (Note 21)

         

Equity:

             

Corporate Office Properties Trust's shareholders' equity:

             
 

Preferred Shares of beneficial interest with an aggregate liquidation preference of $216,333 at December 31, 2010 and 2009 (Note 12)

    81     81  
 

Common Shares of beneficial interest ($0.01 par value; 125,000,000 shares authorized and 66,931,582 shares issued and outstanding at December 31, 2010; 75,000,000 shares authorized and 58,342,673 shares issued and outstanding at December 31, 2009)

    669     583  
 

Additional paid-in capital

    1,511,844     1,238,704  
 

Cumulative distributions in excess of net income

    (281,794 )   (209,941 )
 

Accumulated other comprehensive loss

    (4,163 )   (1,907 )
           

Total Corporate Office Properties Trust's shareholders' equity

    1,226,637     1,027,520  
           

Noncontrolling interests in subsidiaries:

             
 

Common units in the Operating Partnership

    69,337     73,892  
 

Preferred units in the Operating Partnership

    8,800     8,800  
 

Other consolidated entities

    18,364     10,420  
           
 

Noncontrolling interests in subsidiaries

    96,501     93,112  
           

Total equity

    1,323,138     1,120,632  
           

Total liabilities and equity

  $ 3,844,517   $ 3,380,022  
           

See accompanying notes to consolidated financial statements.

F-4


Table of Contents


Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Operations

(Dollars in thousands, except per share data)

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Revenues

                   
 

Rental revenue

  $ 376,112   $ 352,813   $ 334,234  
 

Tenant recoveries and other real estate operations revenue

    83,688     71,171     62,526  
 

Construction contract and other service revenues

    104,675     343,087     188,385  
               
   

Total revenues

    564,475     767,071     585,145  
               

Expenses

                   
 

Property operating expenses

    179,419     157,154     140,895  
 

Depreciation and amortization associated with real estate operations

    123,236     108,529     101,854  
 

Construction contract and other service expenses

    102,302     336,519     184,142  
 

General and administrative expenses

    24,008     23,240     24,096  
 

Business development expenses

    4,197     3,699     1,233  
               
   

Total operating expenses

    433,162     629,141     452,220  
               

Operating income

    131,313     137,930     132,925  

Interest expense

    (101,865 )   (82,187 )   (86,368 )

Interest and other income

    9,568     5,164     2,070  

Gain on early extinguishment of debt

            8,101  
               

Income from continuing operations before equity in income (loss) of unconsolidated entities and income taxes

    39,016     60,907     56,728  

Equity in income (loss) of unconsolidated entities

    1,376     (941 )   (147 )

Income tax expense

    (108 )   (196 )   (201 )
               

Income from continuing operations

    40,284     59,770     56,380  

Discontinued operations

    2,391     1,529     3,832  
               

Income before gain on sales of real estate

    42,675     61,299     60,212  

Gain on sales of real estate, net of income taxes

    2,829         1,104  
               

Net income

    45,504     61,299     61,316  

Less net income attributable to noncontrolling interests:

                   
 

Common units in the Operating Partnership

    (2,116 )   (4,495 )   (6,519 )
 

Preferred units in the Operating Partnership

    (660 )   (660 )   (660 )
 

Other consolidated entities

    32     185     (172 )
               

Net income attributable to Corporate Office Properties Trust

    42,760     56,329     53,965  

Preferred share dividends

    (16,102 )   (16,102 )   (16,102 )
               

Net income attributable to Corporate Office Properties Trust common shareholders

  $ 26,658   $ 40,227   $ 37,863  
               

Net income attributable to Corporate Office Properties Trust:

                   
 

Income from continuing operations

  $ 40,551   $ 54,948   $ 50,711  
 

Discontinued operations, net

    2,209     1,381     3,254  
               
 

Net income attributable to Corporate Office Properties Trust

  $ 42,760   $ 56,329   $ 53,965  
               

Basic earnings per common share(1)

                   
 

Income from continuing operations

  $ 0.39   $ 0.68   $ 0.70  
 

Discontinued operations

    0.04     0.02     0.07  
               
 

Net income attributable to COPT common shareholders

  $ 0.43   $ 0.70   $ 0.77  
               

Diluted earnings per common share(1)

                   
 

Income from continuing operations

  $ 0.39   $ 0.68   $ 0.69  
 

Discontinued operations

    0.04     0.02     0.07  
               
 

Net income attributable to COPT common shareholders

  $ 0.43   $ 0.70   $ 0.76  
               

(1)
Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

See accompanying notes to consolidated financial statements.

F-5


Table of Contents


Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Equity

(Dollars in thousands)

 
  Preferred
Shares
  Common
Shares
  Additional
Paid-in
Capital
  Cumulative
Distributions in
Excess of Net
Income
  Accumulated
Other
Comprehensive
Loss
  Non-
controlling
Interests
  Total  

Balance at December 31, 2007 (47,366,475 common shares outstanding)

  $ 81   $ 474   $ 971,459   $ (129,599 ) $ (2,372 ) $ 129,437   $ 969,480  

Conversion of common units to common shares (258,917 shares)

        3     7,505             (7,508 )    

Common shares issued to the public (3,737,500 shares)

        37     138,886                 138,923  

Exercise of share options (180,239 shares)

        2     2,833                 2,835  

Share-based compensation

        2     9,034                 9,036  

Restricted common share redemptions (61,258 shares)

            (1,320 )               (1,320 )

Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT

            (16,716 )           16,716      

Adjustments related to derivatives designated as cash flow hedges

                    (2,377 )   (330 )   (2,707 )

Increase in tax benefit from share-based compensation

            1,053                 1,053  

Net income

                53,965         7,351     61,316  

Dividends

                (86,938 )           (86,938 )

Distributions to owners of common and preferred units in the Operating Partnership

                        (12,170 )   (12,170 )

Contributions from noncontrolling interests in other consolidated entities

                        3,248     3,248  

Distributions to noncontrolling interests in other consolidated entities

                        (255 )   (255 )

Acquisition of noncontrolling interests in other consolidated entities

                        (78 )   (78 )
                               

Balance at December 31, 2008 (51,790,442 common shares outstanding)

    81     518     1,112,734     (162,572 )   (4,749 )   136,411     1,082,423  

Conversion of common units to common shares (2,841,394 shares)

        28     61,627             (61,655 )    

Common shares issued to the public (2,990,000 shares)

        30     71,795                 71,825  

Exercise of share options (464,601 shares)

        4     5,222                 5,226  

Share-based compensation

        3     10,599                 10,602  

Restricted common share redemptions (79,343 shares)

            (2,049 )               (2,049 )

Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT

            (21,072 )           21,072      

Adjustments related to derivatives designated as cash flow hedges

                      2,842     585     3,427  

Decrease in tax benefit from share-based compensation

            (152 )               (152 )

Net income

                56,329         4,970     61,299  

Dividends

                (103,698 )           (103,698 )

Distributions to owners of common and preferred units in the Operating Partnership

                        (8,622 )   (8,622 )

Contributions from noncontrolling interests in other consolidated entities

                        786     786  

Distributions to noncontrolling interests in other consolidated entities

                        (435 )   (435 )
                               

Balance at December 31, 2009 (58,342,673 common shares outstanding)

    81     583     1,238,704     (209,941 )   (1,907 )   93,112     1,120,632  

Issuance of 4.25% Exchangeable Senior Notes

            18,149                 18,149  

Conversion of common units to common shares (663,498 shares)

        6     9,561             (9,567 )    

Common shares issued to the public (7,475,000 shares)

        75     245,546                 245,621  

Exercise of share options (278,656 shares)

        3     4,572                 4,575  

Share-based compensation

        2     11,843                 11,845  

Restricted common share redemptions (105,215 shares)

            (3,913 )               (3,913 )

Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT

            (10,274 )           10,274      

Adjustments related to derivatives designated as cash flow hedges

                    (2,256 )   472     (1,784 )

Net income

                42,760         2,744     45,504  

Dividends

                (114,613 )           (114,613 )

Distributions to owners of common and preferred units in the Operating Partnership

                        (7,926 )   (7,926 )

Contributions from noncontrolling interests in other consolidated entities

                        9,510     9,510  

Acquisition of noncontrolling interests in other consolidated entities

            (2,344 )           (2,118 )   (4,462 )
                               

Balance at December 31, 2010 (66,931,582 common shares outstanding)

  $ 81   $ 669   $ 1,511,844   $ (281,794 ) $ (4,163 ) $ 96,501   $ 1,323,138  
                               

See accompanying notes to consolidated financial statements.

F-6


Table of Contents


Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows

(Dollars in thousands)

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Cash flows from operating activities

                   
 

Net income

  $ 45,504   $ 61,299   $ 61,316  
 

Adjustments to reconcile net income to net cash provided by operating activities:

                   
   

Depreciation and other amortization

    125,819     111,811     104,968  
   

Amortization of deferred financing costs

    5,871     4,214     3,843  
   

Increase in deferred rent receivable

    (5,706 )   (1,296 )   (10,594 )
   

Amortization of above or below market leases

    (2,078 )   (2,126 )   (2,064 )
   

Amortization of net debt discounts

    5,841     3,412     3,873  
   

Gain on sales of real estate

    (3,917 )       (4,208 )
   

Gain on equity method investment

    (6,406 )   (442 )    
   

Share-based compensation

    11,845     10,602     9,036  
   

Gain on redemption of 3.5% Exchangeable Senior Notes

            (8,101 )
   

Other

    (1,794 )   (3,567 )   (3,610 )
 

Changes in operating assets and liabilities:

                   
   

(Increase) decrease in accounts receivable

    (1,680 )   (3,634 )   11,128  
   

Decrease (increase) in restricted cash and marketable securities and prepaid expenses and other assets

    3,799     (2,745 )   (15,061 )
   

(Decrease) increase in accounts payable, accrued expenses and other liabilities

    (19,644 )   15,787     31,136  
   

(Decrease) increase in rents received in advance and security deposits

    (1,018 )   1,502     (770 )
               
     

Net cash provided by operating activities

    156,436     194,817     180,892  
               

Cash flows from investing activities

                   
 

Purchases of and additions to properties

    (480,587 )   (251,565 )   (280,639 )
 

Proceeds from sales of properties

    27,576     65     33,412  
 

Mortgage and other loan receivables funded or acquired

    (5,588 )   (82,413 )   (25,251 )
 

Leasing costs paid

    (14,403 )   (8,786 )   (7,670 )
 

Investment in unconsolidated entities

    (6,600 )   (3,000 )   (6,000 )
 

Purchases of furniture, fixtures and equipment

    (1,447 )   (2,287 )   (3,581 )
 

Other

    1,882     (1,090 )   (1,093 )
               
     

Net cash used in investing activities

    (479,167 )   (349,076 )   (290,822 )
               

Cash flows from financing activities

                   
 

Proceeds from debt, including issuance of exchangeable senior notes

    1,022,912     1,066,413     1,080,999  
 

Repayments of debt

                   
   

Scheduled principal amortization

    (13,996 )   (11,489 )   (13,668 )
   

Other repayments

    (799,663 )   (863,243 )   (988,945 )
 

Repurchase of 3.5% Exchangeable Senior Notes

            (25,238 )
 

Deferred financing costs paid

    (8,570 )   (3,388 )   (6,461 )
 

Net proceeds from issuance of common shares

    250,196     77,052     141,758  
 

Acquisition of noncontrolling interests in consolidated entities

    (4,462 )        
 

Dividends paid

    (109,894 )   (100,095 )   (83,753 )
 

Distributions paid

    (8,099 )   (9,579 )   (12,002 )
 

Restricted share redemptions

    (3,913 )   (2,049 )   (1,320 )
 

Other

    60     2,124     697  
               
     

Net cash provided by financing activities

    324,571     155,746     92,067  
               

Net increase (decrease) in cash and cash equivalents

    1,840     1,487     (17,863 )

Cash and cash equivalents

                   
 

Beginning of period

    8,262     6,775     24,638  
               
 

End of period

  $ 10,102   $ 8,262   $ 6,775  
               

F-7


Table of Contents


Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows (Continued)

(Dollars in thousands)

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Supplemental disclosures:

                   
 

Interest paid, net of capitalized interest

  $ 87,978   $ 73,389   $ 81,335  
               
 

Income taxes paid

  $   $ 317   $ 1,115  
               

Supplemental schedule of non-cash investing and financing activities:

                   
 

Cancellation of mortgage loans receivable in connection with acquisition of properties

  $   $ 102,575   $  
               
 

Debt and other liabilities assumed in connection with acquisitions

  $ 74,244   $ 3,085   $  
               
 

Increase (decrease) in accrued capital improvements, leasing and other investing activity costs

  $ 4,576   $ 6,256   $ (14,799 )
               
 

Increase in property and noncontrolling interests in connection with property contribution by a noncontrolling interest in a joint venture

  $ 9,000   $   $ 3,349  
               
 

Increase in property and decrease in prepaid and other assets in connection with the consolidation of a joint venture

  $   $   $ 10,859  
               
 

(Decrease) increase in fair value of derivatives applied to AOCL and noncontrolling interests

  $ (1,846 ) $ 3,365   $ (2,769 )
               
 

Dividends/distribution payable

  $ 32,986   $ 28,440   $ 25,794  
               
 

Decrease in noncontrolling interests and increase in shareholders' equity in connection with the conversion of common units into common shares

  $ 9,567   $ 61,654   $ 7,508  
               
 

Adjustments to noncontrolling interests resulting from changes in ownership of Operating Partnership by COPT

  $ 10,274   $ 21,072   $ 16,716  
               

See accompanying notes to consolidated financial statements.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements

1. Organization

        Corporate Office Properties Trust ("COPT") and subsidiaries (collectively, the "Company," "we" or "us") is a fully-integrated and self-managed real estate investment trust ("REIT") that focuses primarily on strategic customer relationships and specialized tenant requirements in the United States Government and defense information technology sectors and data centers serving such sectors. We acquire, develop, manage and lease office and data center properties that are typically concentrated in large office parks primarily located adjacent to government demand drivers and/or in strong markets that we believe possess growth opportunities. As of December 31, 2010, our investments in real estate included the following:

        We conduct almost all of our operations through our operating partnership, Corporate Office Properties, L.P. (the "Operating Partnership"), of which we are the managing general partner. The Operating Partnership owns real estate both directly and through subsidiary partnerships and limited liability companies ("LLCs"). A summary of our Operating Partnership's forms of ownership and the percentage of those ownership forms owned by COPT as of December 31, 2010 and 2009 follows:

 
  December 31,  
 
  2010   2009  

Common Units

    94 %   92 %

Series G Preferred Units

    100 %   100 %

Series H Preferred Units

    100 %   100 %

Series I Preferred Units

    0 %   0 %

Series J Preferred Units

    100 %   100 %

Series K Preferred Units

    100 %   100 %

        Three of our trustees also controlled, either directly or through ownership by other entities or family members, an additional 5% of the Operating Partnership's common units of the Operating Partnership ("common units") as of December 31, 2010.

        In addition to owning real estate, the Operating Partnership also owns entities that provide real estate services such as property management, construction and development and heating and air conditioning services primarily for our properties but also for third parties.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies

Basis of Presentation

        The consolidated financial statements include the accounts of COPT, the Operating Partnership, their subsidiaries and other entities in which we have a majority voting interest and control. We also consolidate certain entities when control of such entities can be achieved through means other than voting rights ("variable interest entities" or "VIEs") if we are deemed to be the primary beneficiary of such entities. We eliminate all significant intercompany balances and transactions in consolidation.

        We use the equity method of accounting when we own an interest in an entity and can exert significant influence over the entity's operations but cannot control the entity's operations.

        We use the cost method of accounting when we own an interest in an entity and cannot exert significant influence over its operations.

Reclassification

        We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.

Use of Estimates in the Preparation of Financial Statements

        We make estimates and assumptions when preparing financial statements under generally accepted accounting principles ("GAAP"). These estimates and assumptions affect various matters, including:

        Significant estimates are inherent in the presentation of our financial statements in a number of areas, including the evaluation of the collectability of accounts and notes receivable, the allocation of property acquisition costs, the determination of estimated useful lives of assets, the determination of lease terms, the evaluation of impairment of long-lived assets, the amount of revenue recognized relating to tenant improvements and the level of expense recognized in connection with share-based compensation. Actual results could differ from these and other estimates.

Acquisitions of Properties

        Upon completion of property acquisitions, we allocate the purchase price to tangible and intangible assets and liabilities associated with such acquisitions based on our estimates of their fair values. We determine these fair values by using market data and independent appraisals available to us and making numerous estimates and assumptions. We allocate property acquisitions to the following components:

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies (Continued)

Properties

        We report properties to be developed or held and used in operations at our depreciated cost, reduced for impairment losses, where appropriate. The preconstruction stage of the development or redevelopment of an operating property includes efforts and related costs to secure land control and zoning, evaluate feasibility and complete other initial tasks which are essential to development. We capitalize interest expense, real estate taxes, direct and indirect project costs and other costs associated with properties, or portions thereof, undergoing construction, development and redevelopment activities. We continue to capitalize these costs while construction, development or redevelopment activities are underway until a property becomes "operational," which occurs upon the earlier of when leases commence or one year after the cessation of major construction activities. When leases commence on portions of a newly-constructed or redeveloped property in the period prior to one year from the cessation of major construction activities, we consider that property to be "partially operational." When a property is partially operational, we allocate the costs associated with the property between the portion that is operational and the portion under construction. We start depreciating newly-constructed and redeveloped properties as they become operational.

        Most of our leases involve some form of improvements to leased space. When we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets. We capitalize the cost of the improvements when we deem the

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies (Continued)


improvements to be landlord assets. In determining whether improvements constitute landlord or tenant assets, we consider numerous factors, including: whether the improvements are unique to the tenant or reusable by other tenants; whether the tenant is permitted to alter or remove the improvements without our consent or without compensating us for any lost fair value; whether the ownership of the improvements remains with us or remains with the tenant at the end of the lease term; and whether the economic substance of the lease terms is properly reflected.

        We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:

•       Buildings and building improvements

  10-40 years

•       Land improvements

  10-20 years

•       Tenant improvements on operating properties

  Related lease terms

•       Equipment and personal property

  3-10 years

        If events or circumstances indicate that a property to be held and used may be impaired, we perform a recoverability analysis based on the estimated undiscounted cash flows to be generated by the property. If the analysis indicates that the carrying value of the property is not recoverable from future cash flows, the property is written down to fair value and an impairment loss is recognized. Fair values are determined based on estimated future cash flows using market-based discount and capitalization rates.

        When we determine that a property is held for sale, we discontinue the recording of depreciation expense on the property and estimate the fair value, net of selling costs; if we then determine that the estimated fair value, net of selling costs, is less than the net book value of the property, we recognize an impairment loss equal to the difference and reduce the net book value of the property.

        When we sell an operating property, or determine that an operating property is held for sale, and determine that we have no significant continuing involvement in such property, we classify the results of operations for such property as discontinued operations. Interest expense that is specifically identifiable to properties included in discontinued operations is used in the computation of interest expense attributable to discontinued operations. When properties classified as discontinued operations are included in computations that determine the amount of our borrowing capacity under certain debt instruments (including our Revolving Credit Facility), we allocate a portion of such debt instruments' interest expense to discontinued operations; we compute this allocation based on the percentage that the related properties represent of all properties included in determining the amount of our borrowing capacity under such debt instruments.

        We expense property maintenance and repair costs when incurred.

Sales of Interests in Real Estate

        We recognize gains from sales of interests in real estate using the full accrual method, provided that various criteria relating to the terms of sale and any subsequent involvement by us with the real estate sold are met. We recognize gains relating to transactions that do not meet the requirements of the full accrual method of accounting when the full accrual method of accounting criteria are met.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies (Continued)

Cash and Cash Equivalents

        Cash and cash equivalents include all cash and liquid investments that mature three months or less from when they are purchased. Cash equivalents are reported at cost, which approximates fair value. We maintain our cash in bank accounts in amounts that may exceed Federally insured limits at times. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.

Revenue Recognition

        We recognize minimum rents, net of abatements, on a straight-line basis over the non-cancelable term of tenant leases (including periods under bargain renewal options). The non-cancelable term of a lease includes periods when a tenant: (1) may not terminate its lease obligation early; or (2) may terminate its lease obligation early in exchange for a fee or penalty that we consider material enough such that termination would not be probable. We report the amount by which our minimum rental revenue recognized on a straight-line basis under leases exceeds the contractual rent billings associated with such leases as deferred rent receivable on our consolidated balance sheets. Amounts by which our minimum rental revenue recognized on a straight-line basis under leases are less than the contractual rent billings associated with such leases are included in deferred revenue associated with operating leases on our consolidated balance sheets.

        In connection with a tenant's entry into, or modification of, a lease, if we make cash payments to, or on behalf of, the tenant for purposes other than funding the construction of landlord assets, we defer the amount of such payments as lease incentives. We amortize lease incentives as a reduction of rental revenue over the term of the lease.

        We recognize tenant recovery revenue in the same periods in which we incur the related expenses. Tenant recovery revenue includes payments from tenants as reimbursement for property taxes, utilities and other property operating expenses.

        We recognize fees received for lease terminations as revenue and write off against such revenue any (1) deferred rents receivable, and (2) deferred revenue, lease incentives and intangible assets that are amortizable into rental revenue associated with the leases; the resulting net amount is the net revenue from the early termination of the leases. When a tenant's lease for space in a property is terminated early but the tenant continues to lease such space under a new or modified lease in the property, the net revenue from the early termination of the lease is recognized evenly over the remaining life of the new or modified lease in place on that property.

        We recognize fees for services provided by us once services are rendered, fees are determinable and collectability is assured. We recognize revenue under construction contracts using the percentage of completion method when the revenue and costs for such contracts can be estimated with reasonable accuracy; when these criteria do not apply to a contract, we recognize revenue on that contract using the completed contract method. Under the percentage of completion method, we recognize a percentage of the total estimated revenue on a contract based on the cost of services provided on the contract as of a point in time relative to the total estimated costs on the contract.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies (Continued)

Accounts and Deferred Rents Receivable and Mortgage and Other Investing Receivables

        We maintain allowances for estimated losses resulting from the failure of our customers or borrowers to satisfy their payment obligations. We use judgment in estimating these allowances based primarily upon the payment history and credit status of the entities associated with the individual receivables. We write off these receivables when we believe the facts and circumstances indicate that continued pursuit of collection is no longer warranted. When we earn interest income in connection with receivables for which we have established allowances, we establish allowances in connection with such interest income that is unpaid. When cash is received in connection with receivables for which we have established allowances, we reduce the amount of losses recognized in connection with the receivables' allowance.

Intangible Assets and Deferred Revenue on Real Estate Acquisitions

        We capitalize intangible assets and deferred revenue on real estate acquisitions as described in the section above entitled "Acquisitions of Properties." We amortize the intangible assets and deferred revenue as follows:

•       Above- and below-market leases

  Related lease terms

•       In-place lease assets

  Related lease terms

•       Tenant relationship value

  Estimated period of time that tenant will lease space in property

•       Above- and below- market cost arrangements

  Term of arrangements

•       Market concentration premium

  40 years

        We recognize the amortization of acquired above-market and below-market leases as adjustments to rental revenue. We recognize the amortization of above- and below- market cost arrangements as adjustments to property operating expenses. We recognize the amortization of other intangible assets on real estate acquisitions as amortization expense.

Deferred Leasing and Financing Costs, net

        We defer costs that we incur to obtain new tenant leases or extend existing tenant leases. We amortize these costs evenly over the lease terms. When tenant leases are terminated early, we expense any unamortized deferred leasing costs associated with those leases over the remaining life of the lease.

        We defer costs for financing arrangements and recognize these costs as interest expense over the related loan terms on a straight-line basis, which approximates the amortization that would occur under the effective interest method of amortization. We expense any unamortized loan costs when loans are retired early.

Interest Rate Derivatives

        Our primary objectives in using interest rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for our

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies (Continued)


making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Derivatives are used to hedge the variable cash flows associated with existing as well as future variable-rate debt. We recognize all derivatives as assets or liabilities in the balance sheet at fair value. We defer the effective portion of changes in fair value of the designated cash flow hedges to accumulated other comprehensive loss ("AOCL") and reclassify such deferrals to interest expense as interest expense is recognized on the hedged forecasted transactions. We recognize the ineffective portion of the change in fair value of interest rate derivatives directly in interest expense. We do not use interest rate derivatives for trading or speculative purposes. We manage counter-party risk by only entering into contracts with major financial institutions based upon their credit ratings and other risk factors.

        We use standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost and termination cost in computing the fair value of derivatives at each balance sheet date.

        Please refer to Note 11 for additional information pertaining to interest rate derivatives.

Share-Based Compensation

        Prior to 2010, we had historically issued two forms of share-based compensation: options to purchase common shares of beneficial interest ("options") and restricted common shares ("restricted shares"). In 2010, we also issued a new form of share-based compensation called performance share units ("PSUs"). We account for share-based compensation in accordance with authoritative guidance provided by the FASB that establishes standards for the accounting for transactions in which an entity exchanges its equity instruments for goods or services, focusing primarily on accounting for transactions in which an entity obtains employee services in share-based payment transactions. The guidance requires us to measure the cost of employee services received in exchange for an award of equity instruments based generally on the fair value of the award on the grant date; such cost is then recognized over the period during which the employee is required to provide service in exchange for the award. No compensation cost is recognized for equity instruments for which employees do not render the requisite service. The guidance also requires that share-based compensation be computed based on awards that are ultimately expected to vest; as a result, future forfeitures of awards are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We capitalize costs associated with share-based compensation attributable to employees engaged in construction and development activities.

        When we adopted the authoritative guidance on accounting for share-based compensation, we elected to adopt the alternative transition method for calculating the tax effects of share-based compensation. The alternative transition method enabled us to use a simplified method to establishing the beginning balance of the additional paid-in capital pool related to the tax effects of employee share-based compensation, which was available to absorb tax deficiencies recognized subsequent to the adoption of this guidance.

        We compute the fair value of options using the Black-Scholes option-pricing model. Under that model, the risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected option life is based on our historical experience of employee exercise behavior. Expected volatility is based on historical volatility of our common shares of beneficial interest ("common

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2. Summary of Significant Accounting Policies (Continued)


shares"). Expected dividend yield is based on the average historical dividend yield on our common shares over a period of time ending on the grant date of the options.

        We compute the fair value of PSUs using a Monte Carlo model. Under that model, the baseline common share value is based on the market value on the grant date. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatility is based on historical volatility of our common shares.

Recent Accounting Pronouncements

        We adopted amended guidance issued by the Financial Accounting Standards Board ("FASB") effective January 1, 2010 related to the accounting and disclosure requirements for the consolidation of VIEs. This guidance requires an enterprise to perform a qualitative analysis when determining whether or not it must consolidate a VIE based primarily on whether the entity (1) has the power to direct matters that most significantly impact the activities of the VIE and (2) has the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. The guidance also requires an enterprise to continuously reassess whether it must consolidate a VIE. Additionally, the standard requires enhanced disclosures about an enterprise's involvement with VIEs and any significant change in risk exposure due to that involvement, as well as how its involvement with VIEs impacts the enterprise's financial statements. As discussed further in Note 6, the adoption of this guidance did not affect our financial position, results of operations or cash flows.

        We adopted guidance issued by the FASB effective January 1, 2010 that requires new disclosures and clarifications to existing disclosures pertaining to transfers in and out of Level 1 and Level 2 fair value measurements, presentation of activity within Level 3 fair value measurements and details of valuation techniques and inputs utilized. Our adoption of this guidance did not have a material effect on our financial statements or disclosures.

3. Fair Value of Financial Instruments

        Accounting standards define fair value as the exit price, or the amount that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The standards also establish a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on market data obtained from sources independent of us. Unobservable inputs are inputs that reflect our assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available in the circumstances. The hierarchy of these inputs is broken down into three levels: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs include (1) quoted prices for similar assets or liabilities in active markets, (2) quoted prices for identical or similar assets or liabilities in markets that are not active and (3) inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly; and Level 3 inputs are unobservable inputs for the asset or liability. Categorization within the valuation hierarchy is based upon the lowest level of input that is most significant to the fair value measurement.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

3. Fair Value of Financial Instruments (Continued)

        The assets held in connection with our non-qualified elective deferred compensation plan (comprised primarily of mutual funds and equity securities) and the corresponding liability to the participants are measured at fair value on a recurring basis on our consolidated balance sheet using quoted market prices, as are other marketable securities that we hold. The deferred compensation plan assets and other marketable securities are included in the line entitled restricted cash and marketable securities on our consolidated balance sheets. The offsetting liability associated with the deferred compensation plan is adjusted to fair value at the end of each accounting period based on the fair value of the plan assets and reported in other liabilities on our consolidated balance sheets. The assets and corresponding liability of our non-qualified elective deferred compensation plan and other marketable securities that we hold are classified in Level 1 of the fair value hierarchy.

        The valuation of our interest rate derivatives is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate market data and implied volatilities in such interest rates. While we determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our interest rate derivatives also utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default. However, as of December 31, 2010, we assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivatives and determined that these adjustments are not significant. As a result, we determined that our interest rate derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

        As discussed in Note 9, we own warrants to purchase common shares in The KEYW Holding Corporation ("KEYW"), an equity method investee. We acquired these warrants in March 2010 and began accounting for such warrants as derivatives in November 2010 when KEYW became a publicly-traded company. We compute the fair value of these warrants using the Black-Scholes option-pricing model. Under that model, the risk-free interest rate is based on the U.S. Treasury yield curve in effect as of the valuation date. The expected life is based on the period of time until the expiration of the warrants. Expected volatility is based on an average of the historical volatility of companies in KEYW's industry that we deem to be comparable. Expected dividend yield is based on the dividend yield on KEYW's common shares as of the date of valuation. The warrants are classified in Level 2 of the fair value hierarchy.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

3. Fair Value of Financial Instruments (Continued)

        The tables below sets forth our financial assets and liabilities that are accounted for at fair value on a recurring basis as of December 31, 2010 and 2009 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  Significant Other
Observable Inputs
(Level 2)
  Significant
Unobservable Inputs
(Level 3)
  Total  

December 31, 2010:

                         

Assets:

                         
 

Marketable securities in deferred compensation plan(1)

                         
   

Mutual funds

  $ 6,114   $   $   $ 6,114  
   

Common stocks

    1,132             1,132  
   

Preferrred stocks

    320             320  
   

Cash and cash equivalents

    422             422  
   

Other

    200             200  
 

Common stock(1)

    363             363  
 

Interest rate derivative(2)

        644         644  
 

Warrants to purchase common shares in KEYW(2)

        466         466  
                   

Assets

  $ 8,551   $ 1,110   $   $ 9,661  
                   

Liabilities:

                         
 

Deferred compensation plan liability(3)

  $ 8,188   $   $   $ 8,188  
 

Interest rate derivatives(3)

        4,226         4,226  
                   

Liabilities

  $ 8,188   $ 4,226   $   $ 12,414  
                   

December 31, 2009:

                         

Assets:

                         
 

Marketable securities in deferred compensation plan(1)

                         
   

Mutual funds

  $ 5,092   $   $   $ 5,092  
   

Common stocks

    620             620  
   

Preferrred stocks

    365             365  
   

Cash and cash equivalents

    608             608  
                   

Assets

  $ 6,685   $   $   $ 6,685  
                   

Liabilities:

                         
 

Deferred compensation plan liability(3)

  $ 6,685   $   $   $ 6,685  
 

Interest rate derivatives(3)

        1,737         1,737  
                   

Liabilities

  $ 6,685   $ 1,737   $   $ 8,422  
                   

(1)
Included in the line entitled "restricted cash and marketable securities" on our consolidated balance sheet.

(2)
Included in the line entitled "prepaid expenses and other assets" on our consolidated balance sheet.

(3)
Included in the line entitled "other liabilities" on our consolidated balance sheet.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

3. Fair Value of Financial Instruments (Continued)

        The carrying values of cash and cash equivalents, restricted cash, accounts receivables, other assets (excluding mortgage loans receivable) and accounts payable and accrued expenses are reasonable estimates of their fair values because of the short maturities of these instruments. We estimated the fair values of our mortgage loans receivable by using discounted cash flow analyses based on an appropriate market rate for a similar type of instrument. We estimated fair values of our debt based on quoted market prices for publicly-traded debt and on the discounted estimated future cash payments to be made for other debt; the discount rates used approximate current market rates for loans, or groups of loans, with similar maturities and credit quality, and the estimated future payments include scheduled principal and interest payments. Fair value estimates are made at a specific point in time, are subjective in nature and involve uncertainties and matters of significant judgment. Settlement of such fair value amounts may not be possible and may not be a prudent management decision.

        We owned other warrants to purchase KEYW common shares that we accounted for as derivatives in 2009 until December 2009 when the terms of the warrants were amended; we exercised these warrants in March 2010. The valuation of these warrants was determined using the Flexible Monte Carlo valuation technique. This technique factors in the price and volatility of the underlying common stock, the exercise price of the warrant agreements, the risk-free rate of return, the probability of exercise and the effect of sub-optimal exercise behaviors. The various inputs used in the valuation of the warrants fall within each of the three levels of the fair value hierarchy. After considering the weighted effect of the various inputs on the valuations of the warrants, we determined that these valuations in their entirety are classified in Level 3 of the fair value hierarchy. The table below sets forth the changes in the warrants during the portion of 2009 in which they were accounted for as derivatives and classified as Level 3 financial instruments (in thousands):

 
  For the Year Ended
December 31,
2009
 

Beginning balance

  $  

Purchases

    636  

Net realized gain included in interest and other income

    587  

Transfers in and out of Level 3

    (1,223 )
       

Ending Balance

  $  
       

        For additional fair value information, please refer to Note 9 for mortgage loans receivable, Note 10 for debt and Note 11 for interest rate derivatives.

4. Concentration of Rental Revenue

        We derived large concentrations of our revenue from real estate operations from certain tenants during the periods set forth in our consolidated statements of operations. The following table summarizes the percentage of our rental revenue (which excludes tenant recoveries and other real estate operations revenue) earned from (1) individual tenants that accounted for at least 5% of our

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

4. Concentration of Rental Revenue (Continued)


rental revenue from continuing and discontinued operations and (2) the aggregate of the five tenants from which we recognized the most rental revenue in the respective years:

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

United States Government

    16 %   15 %   15 %

Northrop Grumman Corporation(1)

    9 %   8 %   8 %

Booz Allen Hamilton, Inc. 

    5 %   6 %   6 %

Five largest tenants

    35 %   34 %   35 %

(1)
Includes affiliated organizations and agencies and predecessor companies.

        We also derived in excess of 90% of our construction contract revenue from the United States Government in each of the years set forth on the consolidated statements of operations.

        In addition, we derived large concentrations of our total revenue from real estate operations (defined as the sum of rental revenue and tenant recoveries and other real estate operations revenue) from certain geographic regions. These concentrations are set forth in the segment information provided in Note 16. Several of these regions, including the Baltimore/Washington Corridor, Northern Virginia, Greater Baltimore, Maryland ("Greater Baltimore"), Suburban Maryland, Washington, DC-Capitol Riverfront and St. Mary's & King George Counties, are within close proximity to each other, and all but two of our regions with real estate operations (Colorado Springs, Colorado ("Colorado Springs") and San Antonio, Texas ("San Antonio")) are located in the Mid-Atlantic region of the United States.

5. Properties, net

        Operating properties, net consisted of the following (in thousands):

 
  December 31,  
 
  2010   2009  

Land

  $ 501,210   $ 479,545  

Buildings and improvements

    2,804,595     2,445,775  
           

    3,305,805     2,925,320  

Less: accumulated depreciation

    (503,032 )   (415,043 )
           

  $ 2,802,773   $ 2,510,277  
           

        As of December 31, 2009, 431 and 437 Ridge Road, two office properties in Dayton, New Jersey totaling 201,000 square feet, and a contiguous land parcel that we were under contract to sell, were classified as held for sale. We completed the sale of the office properties on September 8, 2010 for $20.9 million and recognized a gain of $780,000. We also completed the sale of the contiguous land

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

5. Properties, net (Continued)


parcel on September 8, 2010 for $3.0 million and recognized a gain of $2.5 million. Components associated with these properties as of December 31, 2009 included the following (in thousands):

Land, operating properties

  $ 3,498  

Land, development

    512  

Buildings and improvements

    21,509  

Construction in progress

    583  
       

    26,102  

Less: accumulated depreciation

    (7,569 )
       

  $ 18,533  
       

        Projects we had under construction or development consisted of the following (in thousands):

 
  December 31,  
 
  2010   2009  

Land

  $ 256,487   $ 231,297  

Construction in progress

    386,195     269,793  
           

  $ 642,682   $ 501,090  
           

2010 Acquisitions

        Our acquisitions in 2010 included:

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

5. Properties, net (Continued)

        The table below sets forth the allocation of the aggregate acquisition costs of these properties (in thousands):

Land, operating properties

  $ 13,265  

Land, development

    5,545  

Building and improvements

    173,589  

Construction in progress

    85,525  

Intangible assets on real estate acquisitions

    42,896  
       

Total assets

    320,820  

Below-market leases

    (231 )
       

Total acquisition cost

  $ 320,589  
       

        Intangible assets recorded in connection with the above acquisitions included the following (dollars in thousands):

 
   
  Weighted
Average
Amortization
Period (in Years)
 

In-place lease value

  $ 21,616     4  

Tenant relationship value

    14,450     10  

Above-market cost arrangements

    6,193     40  

Above-market leases

    637     2  
             

  $ 42,896     11  
             

        We expensed $3.4 million in costs in connection with acquisitions in 2010 that are included in business development expenses on our consolidated statements of operations.

2010 Construction, Development and Redevelopment Activities

        During 2010, we had six newly constructed office properties totaling 803,000 square feet (two in the Baltimore/Washington Corridor, two in Colorado Springs and two in San Antonio) become fully operational (94,000 of these square feet were placed into service in 2009) and placed into service 107,000 square feet in three partially operational office properties.

        As of December 31, 2010, we had construction underway on ten office properties totaling 1.0 million square feet (five in the Baltimore/Washington Corridor, three in Greater Baltimore, one in San Antonio and one in St. Mary's and King George Counties) (including 107,000 square feet placed into service in three partially operational properties). We also had development activities underway on nine office properties totaling 1.3 million square feet, including two through a consolidated real estate joint venture (three in the Baltimore/Washington Corridor, two in San Antonio, two in Huntsville, Alabama, one in Greater Baltimore and one in Northern Virginia). In addition, we had redevelopment underway on four office properties totaling 873,000 square feet (two in Greater Philadelphia, one in the Baltimore/Washington Corridor and one in Northern Virginia).

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Notes to Consolidated Financial Statements (Continued)

5. Properties, net (Continued)

2009 Acquisitions

        Through a series of transactions in October 2009, we acquired a 474,000 square foot office tower, a parking lot, a utility distribution center, four waterfront lots and riparian rights, all of which are part of the Canton Crossing planned unit development in Baltimore, Maryland for $123.2 million. These properties are referred to collectively herein as the "Canton Properties." The office building was 89.6% leased on the date of acquisition.

        Other acquisitions in 2009 included:

        The table below sets forth the allocation of the acquisition costs of these properties (in thousands):

Land, operating properties

  $ 50,747  

Land, development

    17,941  

Building and improvements

    68,502  

Construction in progress

    5,100  

Intangible assets on real estate acquisitions

    32,883  
       

Total assets

    175,173  

Below-market leases

    (1,462 )
       

Total acquisition cost

  $ 173,711  
       

        Intangible assets recorded in connection with the above acquisitions included the following (dollars in thousands):

 
   
  Weighted
Average
Amortization
Period (in Years)
 

In-place lease value

  $ 23,172     9  

Tenant relationship value

    2,141     13  

Above-market leases

    1,348     8  

Above-market cost arrangements

    6,222     7  
             

  $ 32,883     9  
             

        We expensed $2.0 million in costs in connection with the above acquisitions in 2009 that are included in business development expenses on our consolidated statements of operations.

2009 Construction and Development Activities

        During 2009, we had seven newly-constructed buildings totaling 750,000 square feet (three in the Baltimore/Washington Corridor, two in Colorado Springs and two in Suburban Maryland) become fully

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

5. Properties, net (Continued)


operational (85,000 of these square feet were placed into service in 2008) and placed into service 94,000 square feet in three partially operational properties (two in Colorado Springs and one in the Baltimore/Washington Corridor).

6. Real Estate Joint Ventures

        During the periods included herein, we had an investment in one unconsolidated real estate joint venture accounted for using the equity method of accounting. Information pertaining to this joint venture investment is set forth below (dollars in thousands):

Investment Balance at(2)    
   
   
   
 
December 31,
2010
  December 31,
2009
  Date
Acquired
  Ownership   Nature of Activity   Maximum
Exposure
to Loss(1)
 
$ (5,545 ) $ (5,088 )   9/29/2005     20 % Operates 16 buildings   $  

(1)
Derived from the sum of our investment balance and maximum additional unilateral capital contributions or loans required from us. Not reported above are additional amounts that we and our partner are required to fund when needed by this joint venture; these funding requirements are proportional to our respective ownership percentages. Also not reported above are additional unilateral contributions or loans from us, the amounts of which are uncertain, that we would be required to make if certain contingent events occur (see Note 21).

(2)
The carrying amount of our investment in this joint venture was lower than our share of the equity in the joint venture by $5.2 million at December 31, 2010 and 2009 due to our deferral of gain on the contribution by us of real estate into the joint venture upon its formation. A difference will continue to exist to the extent the nature of our continuing involvement in the joint venture remains the same.

        Net cash flows of the joint venture are distributed to the partners in proportion to their respective ownership interests. We recognized fees from the joint venture totaling $119,000 in 2009 and $268,000 in 2008 for property management, construction and leasing services.

        The following table sets forth condensed balance sheets for this unconsolidated real estate joint venture (in thousands):

 
  December 31,  
 
  2010   2009  

Operating properties, net

  $ 61,521   $ 62,990  

Other assets

    4,174     5,148  
           
 

Total assets

  $ 65,695   $ 68,138  
           

Liabilities

  $ 67,454   $ 67,611  

Owners' equity

    (1,759 )   527  
           
 

Total liabilities and owners' equity

  $ 65,695   $ 68,138  
           

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

6. Real Estate Joint Ventures (Continued)

        The following table sets forth condensed statements of operations for this unconsolidated real estate joint venture (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Revenues

  $ 8,405   $ 9,031   $ 9,593  

Property operating expenses

    (3,600 )   (3,438 )   (3,371 )

Interest expense

    (3,937 )   (3,981 )   (3,992 )

Depreciation and amortization expense

    (3,154 )   (3,198 )   (3,242 )
               

Net loss

  $ (2,286 ) $ (1,586 ) $ (1,012 )
               

        The table below sets forth information pertaining to our investments in consolidated real estate joint ventures at December 31, 2010 (dollars in thousands):

 
   
   
   
  December 31, 2010(1)  
 
  Date
Acquired
  Ownership
% at
12/31/2010
  Nature of Activity   Total
Assets
  Pledged
Assets
  Total
Liabilities
 

M Square Associates, LLC

    6/26/2007     50.0 % Operating two buildings and developing others(2)   $ 60,028   $ 49,295   $ 44,784  

Arundel Preserve #5, LLC

    7/2/2007     50.0 % Operating one building(3)     29,666     29,362     16,810  

LW Redstone Company, LLC

    3/23/2010     85.0 % Developing land parcel(4)     19,353         129  

COPT-FD Indian Head, LLC

    10/23/2006     75.0 % Developing land parcel(5)     7,452          

MOR Forbes 2 LLC

    12/24/2002     50.0 % Operating one building(6)     3,959         62  
                               

                  $ 120,458   $ 78,657   $ 61,785  
                               

(1)
Excludes amounts eliminated in consolidation.

(2)
This joint venture's properties are in College Park, Maryland (in the Suburban Maryland region).

(3)
This joint venture's property is in Hanover, Maryland (in the Baltimore/Washington Corridor).

(4)
This joint venture's property is in Huntsville, Alabama.

(5)
This joint venture's property is in Charles County, Maryland.

(6)
This joint venture's property is in Lanham, Maryland (in the Suburban Maryland region).

        We determined that all of our real estate joint ventures were VIEs under applicable accounting standards. As discussed in Note 2, we adopted amended guidance issued by the FASB effective January 1, 2010 related to the accounting and disclosure requirements for the consolidation of VIEs. Upon adoption of this standard on January 1, 2010, we re-evaluated our existing:

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Notes to Consolidated Financial Statements (Continued)

6. Real Estate Joint Ventures (Continued)

Therefore, the adoption of this guidance did not affect our financial position, results of operations or cash flows.

        In March 2010, we completed the formation of LW Redstone Company, LLC ("Redstone"), a joint venture created to develop Redstone Gateway, a 468-acre land parcel adjacent to Redstone Arsenal in Huntsville, Alabama. The land is owned by the U.S. Government and is under a long term master lease to the joint venture. Through this master lease, the joint venture will create a business park that we expect will total approximately 4.6 million square feet of office and retail space when completed, including approximately 4.4 million square feet of Class A office space. In addition, the business park will include hotel and other amenities.

        We anticipate funding certain infrastructure costs (up to a maximum of $76.0 million) that we expect will be reimbursed by the City of Huntsville; as of December 31, 2010, we advanced $4.6 million to the City to fund such costs which is included in prepaid expenses and other assets on our consolidated balance sheet. We also expect to fund additional development and construction costs through equity contributions to the extent that third party financing is not obtained. Our partner is not required to make any future contributions to the joint venture. Net cash flow distributions to the partners of Redstone vary depending on the source of the funds distributed and the nature of the capital fundings outstanding at the time of distribution. In the case of all distribution sources, we are first entitled to repayment of operating deficits funded by us and preferred returns on such fundings. We are also generally entitled to repayment of infrastructure and vertical construction costs funded by us and preferred returns on such fundings before our partner is entitled to receive repayment of its equity contribution of $9.0 million. In addition, we will be entitled to 85% of distributable cash in excess of preferred returns.

        We determined that Redstone is a VIE under applicable accounting standards and that we should consolidate it because: (1) we control the activities that are most significant to the VIE (we hold two of three positions on the joint venture's management committee, and we are responsible for the development, construction, leasing and management of the office properties to be constructed by the VIE); and (2) we have both the obligation to provide significant funding for the project, as noted above, and the right to receive returns on our funding.

        With regard to our other consolidated joint ventures:

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Notes to Consolidated Financial Statements (Continued)

6. Real Estate Joint Ventures (Continued)

        Our commitments and contingencies pertaining to our real estate joint ventures are disclosed in Note 21.

7. Intangible Assets on Real Estate Acquisitions

        Intangible assets on real estate acquisitions consisted of the following (in thousands):

 
  December 31, 2010   December 31, 2009  
 
  Gross Carrying
Amount
  Accumulated
Amortization
  Net Carrying
Amount
  Gross Carrying
Amount
  Accumulated
Amortization
  Net Carrying
Amount
 

In-place lease value

  $ 162,708   $ 92,380   $ 70,328   $ 141,408   $ 70,659   $ 70,749  

Tenant relationship value

    50,320     21,603     28,717     35,909     16,322     19,587  

Above-market cost arrangements

    12,415     1,387     11,028     6,222         6,222  

Above-market leases

    10,802     8,193     2,609     10,165     7,138     3,027  

Market concentration premium

    1,333     280     1,053     1,333     247     1,086  
                           

  $ 237,578   $ 123,843   $ 113,735   $ 195,037   $ 94,366   $ 100,671  
                           

Amortization of the intangible asset categories set forth above totaled $28.3 million in 2010, $24.1 million in 2009 and $24.0 million in 2008. The approximate weighted average amortization periods of the categories set forth above follow: in-place lease value: seven years; tenant relationship value: eight years; above-market cost arrangements: 25 years; above-market leases: five years; and market concentration premium: 32 years. The approximate weighted average amortization period for all of the categories combined is nine years. Estimated amortization expense associated with the intangible asset categories set forth above for the next five years is: $24.3 million for 2011; $18.0 million for 2012; $13.5 million for 2013; $11.3 million for 2014 and $9.9 million for 2015.

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Notes to Consolidated Financial Statements (Continued)

8. Deferred Leasing and Financing Costs

        Deferred leasing and financing costs, net consisted of the following (in thousands):

 
  December 31,  
 
  2010   2009  

Deferred leasing costs

  $ 88,265   $ 79,370  

Deferred financing costs

    31,784     23,255  
           

    120,049     102,625  

Accumulated amortization

    (59,400 )   (51,055 )
           

Deferred leasing and financing costs, net

  $ 60,649   $ 51,570  
           

9. Prepaid Expenses and Other Assets

        Prepaid expenses and other assets consisted of the following (in thousands):

 
  December 31,  
 
  2010   2009  

Investment in KEYW

  $ 22,779   $ 9,461  

Prepaid expenses

    19,995     19,769  

Mortgage and other investing receivables

    18,870     12,773  

Furniture, fixtures and equipment, net

    11,504     12,633  

Construction contract costs incurred in excess of billings

    9,372     19,556  

Other assets

    11,376     9,614  
           

Prepaid expenses and other assets

  $ 93,896   $ 83,806  
           

Investment in KEYW

        Our investment in KEYW reflected above consists of common stock and warrants to purchase additional shares of common stock of KEYW, an entity supporting the intelligence community's operations and transformation to Cyber Age mission by providing engineering services and integrated platforms that support the intelligence process. At December 31, 2010, we owned 3.1 million shares, or approximately 12%, of KEYW's common stock, and our Chief Executive Officer served on its Board of Directors. In October 2010, KEYW completed an initial public offering of its common stock. We use the equity method of accounting for our investment in the common stock. Since the results of operations and financial condition of KEYW are not consistently available to us when we issue our financial statements, our equity in KEYW's income or loss is recognized on a one-quarter lag basis. The carrying value of our equity method investment in these common shares was $22.3 million at December 31, 2010 and $9.5 million at December 31, 2009. In connection with this investment, we recognized equity in income (loss) on our consolidated statements of operations as follows: income of $1.8 million in 2010; loss of $623,000 in 2009; and income of $55,000 in 2008. In addition, under the equity method of accounting, additional issuances of equity by KEYW to parties other than us are accounted for as if we sold a proportionate share of our investment and, accordingly, result in our recognition of gain or loss; in connection with issuances of equity by KEYW, including their initial public offering in November 2010, we recognized gains of $6.4 million in 2010 and $442,000 in 2009 that are included in interest and other income on our consolidated statements of operations.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

9. Prepaid Expenses and Other Assets (Continued)

        We acquired warrants to purchase 50,000 additional shares of KEYW common stock at an exercise price of $9.25 per share in March 2010 for $210,000 and began accounting for such warrants as derivatives in November 2010 when KEYW became a publicly-traded company. As a result, we report these warrants at fair value, which, as discussed in Note 3, we estimate using the Black-Scholes option-pricing model. The estimated fair value of these warrants was $466,000, or $9.32 per warrant, at December 31, 2010. We recognized an increase in the warrants' fair value of $256,000 in interest and other income on our consolidated statements of operations for 2010.

        We owned other warrants to purchase KEYW common shares that we accounted for as derivatives in 2009 until December 2009 when the terms of the warrants were amended; we exercised these warrants in March 2010. As discussed in Note 3, the valuation of these warrants was determined using the Flexible Monte Carlo valuation technique. During the period of time in 2009 in which we accounted for these warrants as derivatives, we recognized increases in the warrants' fair value of $587,000 as interest and other income on our consolidated statements of operations.

        We recognized revenue from a lease with KEYW in one of our properties of $668,000 in 2010 and $315,000 in 2009.

Mortgage and Other Investing Receivables

        Mortgage and other investing receivables consisted of the following (in thousands):

 
  December 31,  
 
  2010   2009  

Mortgage loans receivable

  $ 14,227   $ 12,773  

Note receivable from City of Huntsville

    4,643      
           

  $ 18,870   $ 12,773  
           

Our mortgage loans receivable reflected above consist of two loans secured by properties in the Baltimore/Washington Corridor. Our note receivable from the City of Huntsville was to fund infrastructure costs in connection with our Redstone joint venture (see Note 6). We do not have an allowance for credit losses in connection with theses receivables at December 31, 2010. The fair value of our mortgage and other investing receivables totaled $18.8 million at December 31, 2010 and $15.1 million at December 31, 2009.

Operating Notes Receivable

        At December 31, 2010, we had receivables due from tenants with terms exceeding one year totaling $655,000, of which we had allowances for estimated losses of $531,000.

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Notes to Consolidated Financial Statements (Continued)

10. Debt

        Our debt consisted of the following (dollars in thousands):

 
   
  Carrying Value at
December 31,
   
   
 
   
   
  Scheduled
Maturity
Dates at
December 31, 2010
 
  Maximum
Availability at
December 31, 2010
  Stated Interest Rates
at December 31, 2010
 
  2010   2009

Mortgage and Other Secured Loans:

                             
 

Fixed rate mortgage loans(1)

    N/A   $ 1,173,358   $ 1,166,443     5.20% - 7.87%(2 )   2011 - 2034(3)
 

Revolving Construction Facility

  $ 225,000     142,339     76,333     LIBOR + 1.60% to 2.00%(4 )   May 2, 2011(5)
 

Variable rate secured loans

    N/A     310,555     271,146     LIBOR + 2.25% to 3.00%(6 )   2012-2014(7)
 

Other construction loan facility

    23,400     16,753     16,753     LIBOR + 2.75%(8 )   2011(7)
                           
   

Total mortgage and other secured loans

          1,643,005     1,530,675            

Revolving Credit Facility

    800,000     295,000     365,000     LIBOR + 0.75% to 1.25%(9 )   September 30, 2011(7)

Unsecured notes payable(9)

    N/A     1,947     2,019     0%(10 )   2026

Exchangeable Senior Notes:

                             
 

4.25% Exchangeable Senior Notes

    N/A     223,846         4.25%     April 2030(11)
 

3.5% Exchangeable Senior Notes

    N/A     159,883     156,147     3.50%     September 2026(11)
                           
   

Total debt

        $ 2,323,681   $ 2,053,841            
                           

(1)
Several of the fixed rate mortgages carry interest rates that were above or below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates. The carrying values of these loans reflect net unamortized premiums totaling $3.2 million at December 31, 2010 and $371,000 at December 31, 2009.

(2)
The weighted average interest rate on these loans was 6.0% at December 31, 2010.

(3)
A loan with a balance of $4.6 million at December 31, 2010 that matures in 2034 may be repaid in March 2014, subject to certain conditions.

(4)
The weighted average interest rate on this loan was 1.86% at December 31, 2010.

(5)
In January 2011, the maturity date of this loan was extended to 2012.

(6)
Certain of the loans in this category at December 31, 2010 were subject to floor interest rates ranging from 4.25% to 5.50%.

(7)
Includes amounts that may be extended for a one-year period at our option, subject to certain conditions.

(8)
The interest rate on this loan was 3.0% at December 31, 2010.

(9)
The weighted average interest rate on the Revolving Credit Facility was 1.11% at December 31, 2010.

(10)
These notes carry interest rates that were below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates. The carrying value of these notes reflects unamortized discount totaling $1.1 million at December 31, 2010 and $1.2 million at December 31, 2009.

(11)
Refer to paragraph below that discusses the issuance of these notes, for descriptions of provisions for early redemption and repurchase of these notes.

        Our Revolving Credit Facility is with a group of lenders for which KeyBanc Capital Markets and Wachovia Capital Markets, LLC act as co-lead arrangers, KeyBank National Association as

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Notes to Consolidated Financial Statements (Continued)

10. Debt (Continued)


administrative agent and Wachovia Bank, National Association as syndication agent. The lenders' aggregate commitment under the facility is $800.0 million, including a $200.0 million increase that took effect in 2010, which includes a $50.0 million letter of credit subfacility and a $50.0 million swingline facility (same-day draw requests). Amounts available under the facility are computed based on 65% of our unencumbered asset value, as defined in the agreement. The facility matures on September 30, 2011, and may be extended by one year at our option, provided that there is no default under the facility and we pay an extension fee equal to 0.125% of the total availability of the facility. As of December 31, 2010, the maximum amount of borrowing capacity under this facility totaled $800.0 million of which $503.1 million was available.

        We have a construction loan agreement with a group of lenders for which KeyBanc Capital Markets, Inc. act as arranger, KeyBank National Association as administrative agent, Bank of America, N.A. as syndication agent and Manufacturers and Traders Trust Company as documentation agent; this loan is referred to in the table above as the "Revolving Construction Facility." The construction loan agreement provides for an aggregate commitment by the lenders of $225.0 million, with a right for us to further increase the lenders' aggregate commitment during the term to a maximum of $325.0 million, subject to certain conditions. Ownership interests in the properties for which construction costs are being financed through loans under the agreement are pledged as collateral. Borrowings are generally available for properties included in this construction loan agreement based on 85% of the total budgeted costs of construction of the applicable improvements for such properties as set forth in the properties' construction budgets, subject to certain other loan-to-value and debt coverage requirements. As loans for properties under the construction loan agreement are repaid in full and the ownership interests in such properties are no longer pledged as collateral, capacity under the construction loan agreement's aggregate commitment will be restored, giving us the ability to obtain new loans for other construction properties in which we pledge the ownership interests as collateral. The construction loan agreement was scheduled to mature on May 2, 2011 but was extended by one year in January 2011. The construction loan agreement also carries a quarterly fee that is based on the unused amount of the commitment multiplied by a per annum rate of 0.125% to 0.20%.

        In 2006, our Operating Partnership issued a $200.0 million aggregate principal amount of 3.50% Exchangeable Senior Notes due 2026. The notes have an exchange settlement feature that provides that the notes may, under certain circumstances, be exchangeable for cash (up to the principal amount of the notes) and, with respect to any excess exchange value, may be exchangeable into (at our option) cash, our common shares or a combination of cash and our common shares at an exchange rate (subject to adjustment) of 19.1911 shares per one thousand dollar principal amount of the notes (exchange rate is as of December 31, 2010 and is equivalent to an exchange price of $52.11 per common share). On or after September 20, 2011, the Operating Partnership may redeem the notes in cash in whole or in part. The holders of the notes have the right to require us to repurchase the notes in cash in whole or in part on each of September 15, 2011, September 15, 2016 and September 15, 2021, or in the event of a "fundamental change," as defined under the terms of the notes, for a repurchase price equal to 100% of the principal amount of the notes plus accrued and unpaid interest. Prior to September 11, 2011, subject to certain exceptions, if (1) a "fundamental change" occurs as a result of certain forms of transactions or series of transactions and (2) a holder elects to exchange its notes in connection with such a "fundamental change," we will increase the applicable exchange rate for the notes surrendered for exchange by a number of additional shares of our common shares as a "make whole premium." The notes are general unsecured senior obligations of the Operating

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Notes to Consolidated Financial Statements (Continued)

10. Debt (Continued)


Partnership and rank equally in right of payment with all other senior unsecured indebtedness of the Operating Partnership. The Operating Partnership's obligations under the notes are fully and unconditionally guaranteed by us. In November 2008, we repurchased a $37.5 million aggregate principal amount of our 3.5% Exchangeable Senior Notes for $26.7 million from which we recognized a gain of $8.1 million, net of unamortized loan issuance costs. The carrying value of these notes included an unamortized discount totaling $2.6 million at December 31, 2010 and $6.4 million at December 31, 2009. The effective interest rate under the notes, including amortization of the discount, was 5.97%. Because the closing price of our common shares at December 31, 2010, 2009 and 2008 was less than the exchange price per common share applicable to these notes, the if-converted value of the notes did not exceed the principal amount. The table below sets forth interest expense recognized on these notes before deductions for amounts capitalized (in thousands):

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Interest expense at stated interest rate

  $ 5,687   $ 5,687   $ 6,850  

Interest expense associated with amortization of discount

    3,736     3,520     4,016  
               

Total

  $ 9,423   $ 9,207   $ 10,866  
               

        On April 7, 2010, the Operating Partnership issued a $240.0 million aggregate principal amount of 4.25% Exchangeable Senior Notes due 2030. Interest on the notes is payable on April 15 and October 15 of each year. The notes have an exchange settlement feature that provides that the notes may, under certain circumstances, be exchangeable for cash and, at the Operating Partnership's discretion, our common shares at an exchange rate (subject to adjustment) of 20.7891 shares per one thousand dollar principal amount of the notes (exchange rate is as of December 31, 2010 and is equivalent to an exchange price of $48.10 per common share) (the initial exchange rate of the notes was based on a 20% premium over the closing price on the NYSE on the transaction pricing date). On or after April 20, 2015, the Operating Partnership may redeem the notes in cash in whole or in part. The holders of the notes have the right to require us to repurchase the notes in cash in whole or in part on each of April 15, 2015, April 15, 2020 and April 15, 2025, or in the event of a "fundamental change," as defined under the terms of the notes, for a repurchase price equal to 100% of the principal amount of the notes plus accrued and unpaid interest. Prior to April 20, 2015, subject to certain exceptions, if (1) a "fundamental change" occurs as a result of certain forms of transactions or series of transactions and (2) a holder elects to exchange its notes in connection with such "fundamental change," we will increase the applicable exchange rate for the notes surrendered for exchange by a number of additional shares of our common shares as a "make whole premium." The notes are general unsecured senior obligations of the Operating Partnership and rank equally in right of payment with all other senior unsecured indebtedness of the Operating Partnership. The Operating Partnership's obligations under the notes are fully and unconditionally guaranteed by us. The initial liability component of this debt issuance was $221.4 million and the equity component was $18.6 million. In addition, we recognized $450,000 of the financing fees incurred in relation to these notes in equity. The carrying value of these notes included an unamortized discount totaling $16.2 million at December 31, 2010. The effective interest rate on the liability component, including amortization of the issuance costs, is 6.05%. Because the closing price of our common shares at December 31, 2010 was less than the exchange price per common share applicable to these notes, the if-converted value of the notes did

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Notes to Consolidated Financial Statements (Continued)

10. Debt (Continued)


not exceed the principal amount. The table below sets forth interest expense recognized on these notes before deductions for amounts capitalized in 2010 (in thousands):

Interest expense at stated interest rate

  $ 7,480  

Interest expense associated with amortization of discount

    2,445  
       

Total

  $ 9,925  
       

        In the case of each of our mortgage loans, we have pledged certain of our real estate assets as collateral. Many of our real estate properties were pledged on loan obligations as of December 31, 2010. Certain of our debt instruments require that we comply with a number of restrictive financial covenants, including maximum leverage ratio, unencumbered leverage ratio, minimum net worth, minimum fixed charge coverage, minimum unencumbered interest coverage ratio, minimum debt service and maximum secured indebtedness ratio. As of December 31, 2010, we were in compliance with these financial covenants.

        Our debt matures on the following schedule (in thousands):

2011

  $ 733,739 (1)

2012

    271,390  

2013

    146,049  

2014

    210,225  

2015

    396,473  

Thereafter

    582,520  
       

Total

  $ 2,340,396 (2)
       

(1)
Includes $142.3 million in maturities that were extended to 2012 in January 2011 and an additional $311.8 million that may also be extended for one year, subject to certain conditions.

(2)
Represents scheduled principal amortization and maturities only and therefore excludes net discounts of $16.7 million.

        Weighted average borrowings under our Revolving Credit Facility totaled $337.2 million in 2010 and $384.7 million in 2009. The weighted average interest rate on this credit facility was 2.14% in 2010 and 2.75% in 2009.

        We capitalized interest costs of $16.5 million in 2010, $15.5 million in 2009 and $18.3 million in 2008.

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Notes to Consolidated Financial Statements (Continued)

10. Debt (Continued)

        The following table sets forth information pertaining to the fair value of our debt (in thousands):

 
  December 31, 2010   December 31, 2009  
 
  Carrying
Amount
  Estimated
Fair Value
  Carrying
Amount
  Estimated
Fair Value
 

Fixed-rate debt

  $ 1,559,034   $ 1,579,022   $ 1,324,609   $ 1,252,126  

Variable-rate debt

    764,647     769,247     729,232     704,508  
                   

  $ 2,323,681   $ 2,348,269   $ 2,053,841   $ 1,956,634  
                   

11. Interest Rate Derivatives

        The following table sets forth the key terms and fair values of our interest rate swap derivatives at December 31, 2010 and 2009 (dollars in thousands):

 
   
   
   
  Fair Value at
December 31,
 
Notional
Amount
  One-Month
LIBOR Base
  Effective
Date
  Expiration
Date
 
  2010   2009  
$ 120,000     1.7600 %   1/2/2009     5/1/2012   $ (2,062 ) $ (669 )
  100,000     1.9750 %   1/1/2010     5/1/2012     (2,002 )   (1,068 )
  50,000     0.5025 %   1/3/2011     1/3/2012     (64 )    
  50,000     0.5025 %   1/3/2011     1/3/2012     (64 )    
  50,000     0.4400 %   1/4/2011     1/3/2012     (34 )    
  40,000 (1)   3.8300 %   11/2/2010     11/2/2015     644      
                               
                        $ (3,582 ) $ (1,737 )
                               

(1)
The notional amount of this instrument is scheduled to amortize to $36.2 million.

        Each of these interest rate swaps were designated as cash flow hedges of interest rate risk. The table below sets forth the fair value of our interest rate derivatives as well as their classification on our consolidated balance sheet as of December 31, 2010 and 2009 (in thousands):

 
  December 31, 2010   December 31, 2009  
Derivatives Designated as Hedging Instruments
 
  Balance Sheet Location   Fair Value   Balance Sheet Location   Fair Value  

Interest rate swaps

  Prepaid expenses and other assets   $ 644   Prepaid expenses and other assets   $  

Interest rate swaps

  Other liabilities     (4,226 ) Other liabilities     (1,737 )

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Notes to Consolidated Financial Statements (Continued)

11. Interest Rate Derivatives (Continued)

        The table below presents the effect of our interest rate derivatives on our consolidated statements of operations and comprehensive income for 2010 and 2009 (in thousands):

 
  For the Years
Ended December 31,
 
 
  2010   2009  

Amount of loss recognized in AOCL (effective portion)

  $ (5,473 ) $ (3,253 )

Amount of loss reclassified from AOCL into interest expense (effective portion)

    (3,689 )   (6,680 )

Amount of loss recognized in interest expense (ineffective portion and amount excluded from effectiveness testing)

        (261 )

Over the next 12 months, we estimate that approximately $4.0 million will be reclassified from AOCL as an increase to interest expense.

        We have agreements with each of our interest rate derivative counterparties that contain provisions under which if we default or are capable of being declared in default on any of our indebtedness, we could also be declared in default on our derivative obligations. These agreements also incorporate the loan covenant provisions of our indebtedness with a lender affiliate of the derivative counterparties. Failure to comply with the loan covenant provisions could result in our being declared in default on any derivative instrument obligations covered by the agreements. As of December 31, 2010, the fair value of interest rate derivatives in a liability position related to these agreements was $4.2 million, excluding the effects of accrued interest. As of December 31, 2010, we had not posted any collateral related to these agreements. We are not in default with any of these provisions. If we breached any of these provisions, we could be required to settle our obligations under the agreements at their termination value of $4.6 million.

12. Shareholders' Equity

Preferred Shares

        At December 31, 2010, we had 15.0 million preferred shares of beneficial interest ("preferred shares") authorized at $0.01 par value. The table below sets forth additional information pertaining to our preferred shares (dollars in thousands, except per share data):

Series
  # of Shares
Issued
  Aggregate
Liquidation
Preference
  Month of
Issuance
  Annual
Dividend
Yield
  Annual
Dividend
Per Share
  Earliest
Redemption
Date

Series G

    2,200,000   $ 55,000   August 2003     8.000 % $ 2.00000   8/11/2008

Series H

    2,000,000     50,000   December 2003     7.500 % $ 1.87500   12/18/2008

Series J

    3,390,000     84,750   July 2006     7.625 % $ 1.90625   7/20/2011

Series K

    531,667     26,583   January 2007     5.600 % $ 2.80000   1/9/2017
                             

    8,121,667   $ 216,333                    
                             

        Each series of preferred shares is nonvoting and redeemable for cash in the amount of its liquidation preference at our option on or after the earliest redemption date. The Series K Cumulative Redeemable Preferred Shares are also convertible, subject to certain conditions, into common shares

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Notes to Consolidated Financial Statements (Continued)

12. Shareholders' Equity (Continued)


on the basis of 0.8163 common shares for each preferred share, in accordance with the terms of the Articles Supplementary describing the Series K Preferred Shares. Holders of all preferred shares are entitled to cumulative dividends, payable quarterly (as and if declared by our Board of Trustees). In the case of each series of preferred shares, there is a series of preferred units in the Operating Partnership owned by us that carries substantially the same terms.

Common Shares

        During 2009 and 2010, we completed the following public offerings of common shares:

        Holders of common units in our Operating Partnership converted their units into common shares on the basis of one common share for each common unit in the amount of 663,498 in 2010, 2,841,394 in 2009 and 258,917 in 2008.

        We declared dividends per common share of $1.61 in 2010, $1.53 in 2009 and $1.425 in 2008.

        See Note 14 for disclosure of common share activity pertaining to our share-based compensation plans.

Accumulated Other Comprehensive Loss

        The table below sets forth activity in the accumulated other comprehensive loss component of shareholders' equity (in thousands):

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Beginning balance

  $ (1,907 ) $ (4,749 ) $ (2,372 )

Amount of loss recognized in AOCL (effective portion)

    (5,473 )   (3,253 )   (2,769 )

Amount of loss reclassified from AOCL to income (effective portion)

    3,689     6,680     62  

Adjustment to AOCL attributable to noncontrolling interests

    (472 )   (585 )   330  
               

Ending balance

  $ (4,163 ) $ (1,907 ) $ (4,749 )
               

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Notes to Consolidated Financial Statements (Continued)

12. Shareholders' Equity (Continued)

        The table below sets forth total comprehensive income and total comprehensive income attributable to COPT (in thousands):

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Net income

  $ 45,504   $ 61,299   $ 61,316  

Amount of loss recognized in AOCL

    (5,473 )   (3,253 )   (2,769 )

Amount of loss reclassified from AOCL to income

    3,689     6,680     62  
               

Total comprehensive income

    43,720     64,726     58,609  

Net income attributable to noncontrolling interests

    (2,744 )   (4,970 )   (7,351 )

Other comprehensive loss (income) attributable to noncontrolling interests

    153     (349 )   403  
               

Total comprehensive income attributable to COPT

  $ 41,129   $ 59,407   $ 51,661  
               

13. Noncontrolling Interests

        As discussed previously, we consolidate the accounts of our Operating Partnership and its subsidiaries into our financial statements. However, we do not own 100% of the Operating Partnership. We also do not own 100% of certain consolidated real estate joint ventures. The amounts reported for noncontrolling interests on our consolidated balance sheets represent the portion of these consolidated entities' equity that we do not own. The amounts reported for noncontrolling interests on our consolidated statements of operations represent the portion of these entities' net income not allocated to us.

        Common units of the Operating Partnership are substantially similar economically to our common shares. Common units not owned by us are also exchangeable into our common shares, subject to certain conditions.

        The Operating Partnership has 352,000 Series I Preferred Units issued to an unrelated party that have an aggregate liquidation preference of $8.8 million ($25.00 per unit), plus any accrued and unpaid distributions of return thereon (as described below), and may be redeemed for cash by the Operating Partnership at our option any time after September 22, 2019. The owner of these units is entitled to a priority annual cumulative return equal to 7.5% of their liquidation preference through September 22, 2019; the annual cumulative preferred return increases for each subsequent five-year period, subject to certain maximum limits. These units are convertible into common units on the basis of 0.5 common units for each Series I Preferred Unit; the resulting common units would then be exchangeable for common shares in accordance with the terms of the Operating Partnership's agreement of limited partnership.

14. Share-Based Compensation and Employee Benefit Plans

Share-Based Compensation Plans

        On May 13, 2010, we adopted the Amended and Restated 2008 Omnibus Equity and Incentive Plan, which replaced the 2008 Omnibus Equity and Incentive Plan adopted in May 2008. We may issue equity-based awards under this plan to officers, employees, non-employee trustees and any other key

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Notes to Consolidated Financial Statements (Continued)

14. Share-Based Compensation and Employee Benefit Plans (Continued)


persons of us and our subsidiaries, as defined in the plan. The plan provides for a maximum of 5,900,000 common shares of beneficial interest, of which 3,000,000 were added pursuant to the amendment and restatement, to be issued in the form of options, share appreciation rights, deferred share awards, restricted share awards, unrestricted share awards, performance shares, dividend equivalent rights and other equity-based awards and for the granting of cash-based awards. The plan expires on May 13, 2020.

        In March 1998, we adopted a long-term incentive plan for our Trustees and employees. This plan, which expired in March 2008, provided for the award of options, restricted shares and dividend equivalents.

        Grants of restricted shares and options under these plans to nonemployee Trustees generally vest on the first anniversary of the grant date provided that the Trustee remains in his position. Restricted shares and options granted to employees vest based on increments and over periods of time set forth under the terms of the respective awards provided that the employees remain employed by us. Options expire ten years after the date of grant. Shares for each of our share-based compensation plans are issued under registration statements on Form S-8 that became effective upon filing with the Securities and Exchange Commission.

        The following table summarizes restricted share transactions under our share-based compensation plans for 2008, 2009 and 2010:

 
  Shares   Weighted
Average
Grant Date
Fair Value
 

Unvested at December 31, 2007

    415,905   $ 38.50  

Granted

    308,569     31.76  

Forfeited

    (19,851 )   36.07  

Vested

    (142,195 )   35.32  
             

Unvested at December 31, 2008

    562,428     35.69  

Granted

    340,660     25.30  

Forfeited

    (5,081 )   29.83  

Vested

    (229,017 )   35.74  
             

Unvested at December 31, 2009

    668,990     30.43  

Granted

    290,956     37.74  

Forfeited

    (13,986 )   34.38  

Vested

    (276,102 ) $ 32.24  
             

Unvested at December 31, 2010

    669,858   $ 32.77  
             

Restricted shares expected to vest

    648,063   $ 32.81  
             

        The aggregate intrinsic value of restricted shares that vested was $10.3 million in 2010, $5.9 million in 2009 and $4.4 million in 2008.

        On March 4, 2010, our Board of Trustees granted 100,645 PSUs to executives all of which were outstanding at December 31, 2010. The PSUs have a performance period beginning on the grant date and concluding the earlier of three years from the grant date or the date of: (1) termination by the

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Notes to Consolidated Financial Statements (Continued)

14. Share-Based Compensation and Employee Benefit Plans (Continued)


Company without cause, death or disability of the executive or constructive discharge of the executive (collectively, "qualified termination"); or (2) a sale event. The number of PSUs earned ("earned PSUs") at the end of the performance period will be determined based on the percentile rank of the Company's total shareholder return relative to a peer group of companies, as set forth in the following schedule:

Percentile Rank
  Earned PSUs Payout %  

75th or greater

    200% of PSUs granted  

50th or greater

    100% of PSUs granted  

25th

    50% of PSUs granted  

Below 25th

    0% of PSUs granted  

        If the percentile rank exceeds the 25th percentile and is between two of the percentile ranks set forth in the table above, then the percentage of the earned PSUs will be interpolated between the ranges set forth in the table above to reflect any performance between the listed percentiles. At the end of the performance period, we, in settlement of the award, will issue a number of fully-vested common shares equal to the sum of:

        If a performance period ends due to a sale event or qualified termination, the number of earned PSUs is prorated based on the portion of the three-year performance period that has elapsed. If employment is terminated by the employee or by the Company for cause, all PSUs are forfeited. PSUs do not carry voting rights.

        We computed a grant date fair value of $53.31 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $37.84; expected volatility for our common shares of 62.2%; and risk-free interest rate of 1.38%. We are recognizing the grant date fair value in connection with these PSU awards over a three-year period that commenced on March 4, 2010.

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Notes to Consolidated Financial Statements (Continued)

14. Share-Based Compensation and Employee Benefit Plans (Continued)

        The following table summarizes option transactions under our share-based compensation plans for 2008, 2009 and 2010 (dollars in thousands, except per share data):

 
  Shares   Range of
Exercise Price
per Share
  Weighted
Average
Exercise
Price per
Share
  Weighted
Average
Remaining
Contractual
Term
(in Years)
  Aggregate
Intrinsic
Value
 

Outstanding at December 31, 2007

    2,141,344   $7.38 - $57.00   $ 25.29     6   $ 22,639  

Granted—2008

    40,000   $37.81     37.81              

Forfeited/Expired—2008

    (51,786 ) $8.00 - $53.16     43.07              

Exercised—2008

    (180,239 ) $7.63 - $34.76     15.72              
                             

Outstanding at December 31, 2008

    1,949,319   $7.38 - $57.00     25.96     5   $ 18,744  

Granted—2009

    50,000   $29.98 - $37.61     31.51              

Forfeited/Expired—2009

    (32,812 ) $25.52 - $53.16     44.33              

Exercised—2009

    (464,601 ) $7.38 - $35.87     11.25              
                             

Outstanding at December 31, 2009

    1,501,906   $8.63 - $57.00     30.29     5   $ 14,579  

Forfeited/Expired—2010

    (34,966 ) $41.33 - $49.60     46.59              

Exercised—2010

    (278,656 ) $8.63 - $42.07     16.42              
                             

Outstanding at December 31, 2010

    1,188,284   $9.54 - $57.00   $ 33.07     5   $ 7,987  
                             

Exercisable at December 31, 2008

    1,657,956     (1) $ 22.60              
                             

Exercisable at December 31, 2009

    1,389,141     (2) $ 29.42              
                             

Exercisable at December 31, 2010

    1,188,284     (3) $ 33.07              
                             

(1)
228,732 of these options had an exercise price ranging from $7.38 to $7.99; 195,950 had an exercise price ranging from $8.00 to $10.99; 395,217 had an exercise price ranging from $11.00 to $16.99; 226,805 had an exercise price ranging from $17.00 to $25.99; 210,373 had an exercise price ranging from $26.00 to $34.99; 242,082 had an exercise price ranging from $35.00 to $43.99; and 158,797 had an exercise price ranging from $44.00 to $57.00.

(2)
83,441 of these options had an exercise price ranging from $8.63 to $10.99; 345,792 had an exercise price ranging from $11.00 to $16.99; 172,914 had an exercise price ranging from $17.00 to $25.99; 190,287 had an exercise price ranging from $26.00 to $34.99; 343,040 had an exercise price ranging from $35.00 to $43.99; and 253,667 had an exercise price ranging from $44.00 to $57.00.

(3)
231,946 of these options had an exercise price ranging from $9.54 to $16.73; 246,103 had an exercise price ranging from $16.74 to $30.04; 205,012 had an exercise price ranging from $30.05 to $41.28; 253,607 had an exercise price ranging from $41.29 to $45.24; 251,616 had an exercise price ranging from $45.25 to $57.

        The aggregate intrinsic value of options exercised was $5.9 million in 2010, $10.4 million in 2009 and $3.7 million in 2008.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

14. Share-Based Compensation and Employee Benefit Plans (Continued)

        We computed share-based compensation expense for options under the fair value method using the Black-Scholes option-pricing model; the weight average assumptions we used in that model for options granted in 2008 and 2009 are set forth below:

 
  For the Years Ended
December 31,
 
 
  2009   2008(4)  

Weighted average fair value of grants on grant date

  $ 10.15   $ 8.00  

Risk-free interest rate(1)

    2.20 %   3.62 %

Expected life-years

    5.32     6.52  

Expected volatility(2)

    47.71 %   24.22 %

Expected dividend yield(3)

    3.77 %   3.07 %

(1)
Ranged from 2.08% to 2.70% in 2009.

(2)
Ranged from 47.60% to 48.17% in 2009.

(3)
Ranged from 3.73% to 3.93% in 2009.

(4)
Since one group of grants sharing the same terms took place in 2008, the assumptions used for such grants were uniform.

        We own a taxable REIT subsidiary that is subject to Federal and state income taxes. We realized a windfall tax shortfall of $152,000 in 2009 and benefit of $1.1 million in 2008 on options exercised and vesting restricted shares in connection with employees of our subsidiaries that are subject to income tax.

        The table below sets forth information relating to expenses from share-based compensation included in our consolidated statements of operations (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Increase in general and administrative expenses

  $ 9,787   $ 8,173   $ 6,324  

Increase in construction contract and other service operations expenses

    2,058     2,429     2,712  
               

Share-based compensation expense

  $ 11,845   $ 10,602   $ 9,036  
               

        We capitalized share-based compensation costs of approximately $794,000 in 2010, $620,000 in 2009 and $769,000 in 2008.

        The amounts included in our consolidated statements of operations for share-based compensation reflected an estimate of pre-vesting forfeitures of 0% for options and PSUs and 0% to 4% for restricted shares for 2010, 0% for options and 2% to 5% for restricted shares for 2009 and 7% for options and 2% to 5% for restricted shares for 2008.

        As of December 31, 2010, all of our options are vested and fully expensed. As of December 31, 2010, there was $12.8 million of unrecognized compensation cost related to unvested restricted shares that is expected to be recognized over a weighted average period of approximately two years. As of

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Notes to Consolidated Financial Statements (Continued)

14. Share-Based Compensation and Employee Benefit Plans (Continued)


December 31, 2010, there was $3.9 million of unrecognized compensation cost related to PSUs that is expected to be recognized over the remaining performance period of approximately two years.

401(k) Plan

        We have a 401(k) defined contribution plan covering substantially all of our employees that permits participants to defer up to a maximum of 15% of their compensation on an after tax basis. Participants who are 50 years of age or older by the end of a particular plan year and have contributed the maximum 401(k) deferral amount allowed under the plan for that year are eligible to contribute an additional portion of their annual compensation on a before-tax basis as catch-up contributions, up to the annual limit under the Internal Revenue Code of 1986, as amended. For contributions to the plan occurring subsequent to December 31, 2008, we match 100% of the first 1% of pre-tax and/or after-tax contributions that participants contribute to the plan and 50% of the next 5% in participant contributions to the plan (representing an aggregate match by us of 3.5% on the first 6% of participant pre-tax and/or after-tax contributions to the plan). For contributions to the plan occurring through December 31, 2008, we matched 50% of the first 6% of pre-tax and/or after-tax contributions that participants contributed to the Plan. Participants' contributions are fully vested. For matching contributions made subsequent to December 31, 2008, a participant is 50% vested in Company matching contributions after one year of credited service and 100% vested after two years of credited service. For matching contributions made through December 31, 2008, a participant is 30% vested in Company matching contributions after one year of credited service, 60% vested after two years of credited service and 100% vested after three years of credited service. We fund all contributions with cash. Our matching contributions under the plan totaled approximately $1.0 million in 2010, $969,000 in 2009 and $641,000 in 2008. The 401(k) plan is fully funded at December 31, 2010.

Deferred Compensation Plan

        We have a non-qualified elective deferred compensation plan for certain members of our management team that permits participants to defer up to 100% of their compensation on a pre-tax basis and receive a tax-deferred return on such deferrals. We match the participant's contribution in an amount equal to 50% of the participant's elective deferral for the plan year up to a maximum of 6% of a participant's annual compensation after deducting contributions, if any, made under our 401(k) plan. Deferred compensation related to an employee contribution is charged to expense and is fully vested. Deferred compensation related to the Company's matching contribution is charged to expense and vests in annual one-third increments. Once an employee has been with us for three years, all matching contributions are fully vested. The balance of the plan, which was fully funded, totaled $8.2 million at December 31, 2010 and $6.7 million at December 31, 2009, and is included in the accompanying consolidated balance sheets.

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Notes to Consolidated Financial Statements (Continued)

15. Operating Leases

        We lease our properties to tenants under operating leases with various expiration dates extending to the year 2025. Gross minimum future rentals on noncancelable leases in our consolidated properties at December 31, 2010 were as follows (in thousands):

Year Ending December 31,
   
 

2011

  $ 359,021  

2012

    320,637  

2013

    274,035  

2014

    237,258  

2015

    189,186  

Thereafter

    520,063  
       

  $ 1,900,200  
       

16. Information by Business Segment

        As of December 31, 2010, we had nine primary office property segments (comprised of: the Baltimore/Washington Corridor; Greater Baltimore; Northern Virginia; Colorado Springs; Suburban Maryland; San Antonio; Washington, DC-Capitol Riverfront; Greater Philadelphia; and St. Mary's & King George Counties) and a wholesale data center segment.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

16. Information by Business Segment (Continued)

        The table below reports segment financial information for our real estate operations (in thousands). Our segment entitled "Other" includes assets and operations not specifically associated with the other defined segments, including certain properties as well as corporate assets and investments in unconsolidated entities. We measure the performance of our segments through a measure we define as net operating income from real estate operations ("NOI from real estate operations"), which is derived by subtracting property operating expenses from revenues from real estate operations. We believe that NOI from real estate operations is an important supplemental measure of operating performance for a REIT's operating real estate because it provides a measure of the core operations that is unaffected by depreciation, amortization, financing and general and administrative expenses; this measure is particularly useful in our opinion in evaluating the performance of geographic segments, same-office property groupings and individual properties (in thousands).

 
  Baltimore/
Washington
Corridor
  Greater
Baltimore
  Northern
Virginia
  Colorado
Springs
  Suburban
Maryland
  San
Antonio
  Washington, DC
–Capitol
Riverfront
  Greater
Philadelphia
  St. Mary's &
King George
Counties
  Wholesale
Data
Center
  Other   Total  

Year Ended December 31, 2010

                                                                         

Revenues from real estate operations

  $ 207,456   $ 71,850   $ 75,063   $ 24,897   $ 21,759   $ 21,673   $ 4,678   $ 6,299   $ 13,967   $ 1,062   $ 13,024   $ 461,728  

Property operating expenses

    77,340     31,491     28,115     9,137     9,657     10,447     1,708     2,274     4,340     1,202     4,052     179,763  
                                                   

NOI from real estate operations

  $ 130,116   $ 40,359   $ 46,948   $ 15,760   $ 12,102   $ 11,226   $ 2,970   $ 4,025   $ 9,627   $ (140 ) $ 8,972   $ 281,965  
                                                   

Additions to properties, net

  $ 90,054   $ 38,586   $ 108,438   $ 3,499   $ 4,434   $ 19,064   $ 92,811   $ 20,714   $ 7,090   $ 125,636   $ 15,084   $ 525,410  
                                                   

Segment assets at December 31, 2010

  $ 1,392,524   $ 585,001   $ 545,560   $ 265,119   $ 176,776   $ 154,787   $ 120,492   $ 122,734   $ 99,412   $ 129,815   $ 252,297   $ 3,844,517  
                                                   

Year Ended December 31, 2009

                                                                         

Revenues from real estate operations

  $ 197,610   $ 58,275   $ 79,132   $ 23,125   $ 19,620   $ 13,566   $   $ 7,983   $ 13,960   $   $ 13,584   $ 426,855  

Property operating expenses

    72,902     25,560     30,111     7,391     8,393     4,479         1,271     3,491         3,808     157,406  
                                                   

NOI from real estate operations

  $ 124,708   $ 32,715   $ 49,021   $ 15,734   $ 11,227   $ 9,087   $   $ 6,712   $ 10,469   $   $ 9,776   $ 269,449  
                                                   

Additions to properties, net

  $ 98,437   $ 124,637   $ 7,673   $ 22,593   $ 24,022   $ 38,353   $   $ 9,126   $ 2,200   $   $ 3,960   $ 331,001  
                                                   

Segment assets at December 31, 2009

  $ 1,332,579   $ 569,590   $ 451,965   $ 270,358   $ 179,453   $ 134,986   $   $ 105,372   $ 94,732   $   $ 240,987   $ 3,380,022  
                                                   

Year Ended December 31, 2008

                                                                         

Revenues from real estate operations

  $ 184,250   $ 54,626   $ 75,974   $ 20,343   $ 19,294   $ 9,311   $   $ 10,025   $ 12,894   $   $ 13,274   $ 399,991  

Property operating expenses

    65,474     23,978     29,520     7,284     7,102     2,425         202     3,245         2,119     141,349  
                                                   

NOI from real estate operations

  $ 118,776   $ 30,648   $ 46,454   $ 13,059   $ 12,192   $ 6,886   $   $ 9,823   $ 9,649   $   $ 11,155   $ 258,642  
                                                   

Additions to properties, net

  $ 84,299   $ 17,132   $ 4,294   $ 73,683   $ 38,302   $ 34,973   $   $ 1,575   $ 2,801   $   $ 18,908   $ 275,967  
                                                   

Segment assets at December 31, 2008

  $ 1,263,939   $ 439,114   $ 464,198   $ 252,559   $ 152,918   $ 96,643   $   $ 95,783   $ 95,288   $   $ 253,797   $ 3,114,239  
                                                   

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

16. Information by Business Segment (Continued)

        The following table reconciles our segment revenues from real estate operations to total revenues as reported on our consolidated statements of operations (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Segment revenues from real estate operations

  $ 461,728   $ 426,855   $ 399,991  

Construction contract and other service revenues

    104,675     343,087     188,385  

Less: Revenues from discontinued operations (Note 18)

    (1,928 )   (2,871 )   (3,231 )
               

Total revenues

  $ 564,475   $ 767,071   $ 585,145  
               

        The following table reconciles our segment property operating expenses to property operating expenses as reported on our consolidated statements of operations (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Segment property operating expenses

  $ 179,763   $ 157,406   $ 141,349  

Less: Property operating expenses from discontinued operations (Note 18)

    (344 )   (252 )   (454 )
               

Total property operating expenses

  $ 179,419   $ 157,154   $ 140,895  
               

        As previously discussed, we provide real estate services such as property management, construction and development and heating and air conditioning services primarily for our properties but also for third parties. The primary manner in which we evaluate the operating performance of our service activities is through a measure we define as net operating income from service operations ("NOI from service operations"), which is based on the net of the revenues and expenses from these activities. Construction contract and other service revenues and expenses consist primarily of subcontracted costs that are reimbursed to us by the customer along with a management fee. The operating margins from these activities are small relative to the revenue. We believe NOI from service operations is a useful measure in assessing both our level of activity and our profitability in conducting such operations. The table below sets forth the computation of our NOI from service operations (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Construction contract and other service revenues

  $ 104,675   $ 343,087   $ 188,385  

Construction contract and other service expenses

    (102,302 )   (336,519 )   (184,142 )
               

NOI from service operations

  $ 2,373   $ 6,568   $ 4,243  
               

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

16. Information by Business Segment (Continued)

        The following table reconciles our NOI from real estate operations for reportable segments and NOI from service operations to income from continuing operations as reported on our consolidated statements of operations (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

NOI from real estate operations

  $ 281,965   $ 269,449   $ 258,642  

NOI from service operations

    2,373     6,568     4,243  

Interest and other income

    9,568     5,164     2,070  

Gain on early extinguishment of debt

            8,101  

Equity in income (loss) of unconsolidated entities

    1,376     (941 )   (147 )

Income tax expense

    (108 )   (196 )   (201 )

Other adjustments:

                   
 

Depreciation and amortization associated with real estate operations

    (123,236 )   (108,529 )   (101,854 )
 

General and administrative expenses

    (24,008 )   (23,240 )   (24,096 )
 

Business development expenses

    (4,197 )   (3,699 )   (1,233 )
 

Interest expense on continuing operations

    (101,865 )   (82,187 )   (86,368 )
 

NOI from discontinued operations

    (1,584 )   (2,619 )   (2,777 )
               

Income from continuing operations

  $ 40,284   $ 59,770   $ 56,380  
               

        The accounting policies of the segments are the same as those used to prepare our consolidated financial statement, except that discontinued operations are not presented separately for segment purposes. We did not allocate interest expense and depreciation and amortization to our real estate segments since they are not included in the measure of segment profit reviewed by management. We also did not allocate general and administrative expenses, business development expenses, interest and other income, equity in income (loss) of unconsolidated entities, income taxes, gain on early extinguishment of debt and noncontrolling interests because these items represent general corporate items not attributable to segments.

17. Income Taxes

        We elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code. To qualify as a REIT, we must meet a number of organizational and operational requirements, including a requirement that we distribute at least 90% of our adjusted taxable income to our shareholders. As a REIT, we generally will not be subject to Federal income tax on taxable income that we distribute to our shareholders. If we fail to qualify as a REIT in any tax year, we will be subject to Federal income tax on our taxable income at regular corporate rates and may not be able to qualify as a REIT for four subsequent tax years.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

17. Income Taxes (Continued)

        The differences between taxable income reported on our income tax return (estimated 2010 and actual 2009 and 2008) and net income as reported on our consolidated statements of operations are set forth below (in thousands):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  
 
  (Estimated)
   
   
 

Net income

  $ 45,504   $ 61,299   $ 61,316  

Adjustments:

                   
 

Rental revenue recognition

    (8,413 )   (1,646 )   (12,681 )
 

Compensation expense recognition

    (4,820 )   (5,240 )   1,600  
 

Operating expense recognition

    280     1,061     965  
 

Gain on sales of properties

    1,158         (4,358 )
 

Losses from service operations

    (1,628 )   303     (1,867 )
 

Income tax expense

    119     196     779  
 

Depreciation and amortization

    42,839     36,031     36,181  
 

Discounts/premiums included in interest expense

    5,713     3,390     (170 )
 

Income from unconsolidated entities

    (118 )   (12 )   82  
 

Noncontrolling interests, gross

    (2,091 )   (5,813 )   (1,568 )
 

Other

    1,408     (2,954 )   1,517  
               

Taxable income

  $ 79,951   $ 86,615   $ 81,796  
               

        For Federal income tax purposes, dividends to shareholders may be characterized as ordinary income, capital gains or return of capital. The characterization of dividends declared on our common and preferred shares during each of the last three years was as follows:

 
  Common Shares   Preferred Shares  
 
  For the Years Ended
December 31,
  For the Years Ended
December 31,
 
 
  2010   2009   2008   2010   2009   2008  

Ordinary income

    59.7 %   87.5 %   94.0 %   88.3 %   100.0 %   98.4 %

Long term capital gain

    8.0 %   0.0 %   1.5 %   11.7 %   0.0 %   1.6 %

Return of capital

    32.3 %   12.5 %   4.5 %   0.0 %   0.0 %   0.0 %

        We distributed all of our REIT taxable income in 2010, 2009 and 2008 and, as a result, did not incur Federal income tax in those years on such income.

        The net basis of our assets and liabilities for tax reporting purposes is approximately $310.0 million lower than the amount reported on our consolidated balance sheet at December 31, 2010, which is primarily related to differences in basis for net properties, intangible assets on real estate acquisitions and deferred rent receivable.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

17. Income Taxes (Continued)

        We own a taxable REIT subsidiary ("TRS") that is subject to Federal and state income taxes. Our TRS had income before income taxes under GAAP of $345,000 in 2010, $506,000 in 2009 and $2.0 million in 2008. Our TRS' provision for income tax consisted of the following (in thousands):

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Deferred

                   
 

Federal

  $ (64 ) $ 115   $ 352  
 

State

    (14 )   25     26  
               

    (78 )   140     378  
               

Current

                   
 

Federal

    161     46     328  
 

State

    36     10     73  
               

    197     56     401  
               

Total income tax expense

 
$

119
 
$

196
 
$

779
 
               

Reported on line entitled income tax expense

  $ 108   $ 196   $ 201  

Reported on line entitled gain on sales of real estate, net

    11         578  
               

Total income tax expense

  $ 119   $ 196   $ 779  
               

        A reconciliation of our TRS' Federal statutory rate to the effective tax rate for income tax reported on our statements of operations is set forth below:

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Income taxes at U.S. statutory rate

    34.0 %   34.0 %   34.0 %

State and local, net of U.S. Federal tax benefit

    4.2 %   4.6 %   4.6 %

Other

    (3.5 )%   0.1 %   0.1 %
               

Effective tax rate

    34.7 %   38.7 %   38.7 %
               

        Items in our TRS contributing to temporary differences that lead to deferred taxes include depreciation and amortization, share-based compensation, certain accrued compensation, compensation paid in the form of contributions to a deferred nonqualified compensation plan and net operating losses that are not deductible until future periods.

        We are subject to certain state and local income and franchise taxes. The expense associated with these state and local taxes is included in general and administrative expense on our consolidated statements of operations. We did not separately state these amounts on our consolidated statements of operations because they are insignificant.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

18. Discontinued Operations

        Income from discontinued operations primarily includes revenues and expenses associated with the following:

        Certain reclassifications have been made in prior periods to reflect discontinued operations consistent with the current period presentation. The table below sets forth the components of discontinued operations reported on our consolidated statements of operations (in thousands):

 
  For the Years Ended
December 31,
 
 
  2010   2009   2008  

Revenue from real estate operations

  $ 1,928   $ 2,871   $ 3,231  
               

Expenses from real estate operations:

                   
 

Property operating expenses

    344     252     454  
 

Depreciation and amortization

    7     857     918  
               

Expenses from real estate operations

    351     1,109     1,372  
               

Operating income from real estate operations

    1,577     1,762     1,859  

Interest expense

    (263 )   (233 )   (553 )

Gain on sales of real estate

    1,077         2,526  
               

Discontinued operations

  $ 2,391   $ 1,529   $ 3,832  
               

19. Earnings Per Share ("EPS")

        We present both basic and diluted EPS. We compute basic EPS by dividing net income available to common shareholders allocable to unrestricted common shares under the two-class method by the weighted average number of unrestricted common shares outstanding during the year. Our computation of diluted EPS is similar except that:

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

19. Earnings Per Share ("EPS") (Continued)

Summaries of the numerator and denominator for purposes of basic and diluted EPS calculations are set forth below (in thousands, except per share data):

 
  For the Years Ended December 31,  
 
  2010   2009   2008  

Numerator:

                   

Income from continuing operations

  $ 40,284   $ 59,770   $ 56,380  

Add: Gain on sales of real estate, net

    2,829         1,104  

Less: Preferred share dividends

    (16,102 )   (16,102 )   (16,102 )

Less: Income from continuing operations attributable to noncontrolling interests

    (2,562 )   (4,822 )   (6,773 )

Less: Income from continuing operations attributable to restricted shares

    (1,071 )   (1,010 )   (728 )
               

Numerator for basic and diluted EPS from continuing operations attributable to COPT common shareholders

    23,378     37,836     33,881  

Add: Discontinued operations, net

    2,391     1,529     3,832  

Less: Discontinued operations, net attributable to noncontrolling interests

    (182 )   (148 )   (578 )
               

Numerator for basic and diluted EPS on net income attributable to COPT common shareholders

  $ 25,587   $ 39,217   $ 37,135  
               

Denominator (all weighted averages):

                   

Denominator for basic EPS (common shares)

    59,611     55,930     48,132  

Dilutive effect of share-based compensation awards

    333     477     688  
               

Denominator for diluted EPS

    59,944     56,407     48,820  
               

Basic EPS:

                   
 

Income from continuing operations attributable to COPT common shareholders

  $ 0.39   $ 0.68   $ 0.70  
 

Discontinued operations attributable to COPT common shareholders

    0.04     0.02     0.07  
               
 

Net income attributable to COPT common shareholders

  $ 0.43   $ 0.70   $ 0.77  
               

Diluted EPS:

                   
 

Income from continuing operations attributable to COPT common shareholders

  $ 0.39   $ 0.68   $ 0.69  
 

Discontinued operations attributable to COPT common shareholders

    0.04     0.02     0.07  
               
 

Net income attributable to COPT common shareholders

  $ 0.43   $ 0.70   $ 0.76  
               

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

19. Earnings Per Share ("EPS") (Continued)

Our diluted EPS computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPS for the respective years (in thousands):

 
  Weighted Average Shares
Excluded from
Denominator for the
Years Ended
December 31,
 
 
  2010   2009   2008  

Conversion of common units

    4,608     5,717     8,107  

Conversion of convertible preferred units

    176     176     176  

Conversion of convertible preferred shares

    434     434     434  

        As discussed in Note 10, we have outstanding senior notes that have an exchange settlement feature but did not affect our diluted EPS reported above since the weighted average closing price of our common shares during each of the years was less than the exchange prices per common share applicable for such years.

        The following share-based compensation securities were excluded from the computation of diluted EPS because their effect was antidilutive:

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

20. Quarterly Data (Unaudited)

        The tables below set forth selected quarterly information for the years ended December 31, 2010 and 2009 (in thousands, except per share data). Certain of the amounts below have been reclassified to conform to the current period presentation of our consolidated financial statements.

 
  For the Year Ended December 31, 2010  
 
  First
Quarter
  Second
Quarter
  Third
Quarter
  Fourth
Quarter
 

Revenues

  $ 149,593   $ 135,322   $ 128,158   $ 151,402  
                   

Operating income

  $ 31,408   $ 33,976   $ 30,841   $ 35,088  
                   

Income from continuing operations

  $ 9,826   $ 8,330   $ 5,320   $ 16,808  
                   

Discontinued operations

  $ 832   $ 486   $ 1,129   $ (56 )
                   

Net income

  $ 10,675   $ 9,151   $ 8,926   $ 16,752  

Net income attributable to noncontrolling interests

    (737 )   (685 )   (94 )   (1,228 )
                   

Net income attributable to COPT

    9,938     8,466     8,832     15,524  

Preferred share dividends

    (4,025 )   (4,026 )   (4,025 )   (4,026 )
                   

Net income attributable to COPT common shareholders

  $ 5,913   $ 4,440   $ 4,807   $ 11,498  
                   

Basic earnings per share:

                         
 

Income from continuing operations

  $ 0.08   $ 0.06   $ 0.06   $ 0.18  
                   
 

Net income attributable to COPT common shareholders

  $ 0.10   $ 0.07   $ 0.08   $ 0.18  
                   

Diluted earnings per share:

                         
 

Income from continuing operations

  $ 0.08   $ 0.06   $ 0.06   $ 0.18  
                   
 

Net income attributable to COPT common shareholders

  $ 0.10   $ 0.07   $ 0.08   $ 0.18  
                   

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

20. Quarterly Data (Unaudited) (Continued)

 

 
  For the Year Ended December 31, 2009  
 
  First
Quarter
  Second
Quarter
  Third
Quarter
  Fourth
Quarter
 

Revenues

  $ 180,997   $ 208,331   $ 199,453   $ 178,290  
                   

Operating income

  $ 36,244   $ 35,297   $ 34,271   $ 32,118  
                   

Income from continuing operations

  $ 17,774   $ 17,675   $ 15,154   $ 9,167  
                   

Discontinued operations

  $ 392   $ 376   $ 382   $ 379  
                   

Net income

  $ 18,166   $ 18,051   $ 15,536   $ 9,546  

Net income attributable to noncontrolling interests

    (2,019 )   (1,412 )   (1,081 )   (458 )
                   

Net income attributable to COPT

    16,147     16,639     14,455     9,088  

Preferred share dividends

    (4,025 )   (4,026 )   (4,025 )   (4,026 )
                   

Net income attributable to COPT common shareholders

  $ 12,122   $ 12,613   $ 10,430   $ 5,062  
                   

Basic earnings per share:

                         
 

Income from continuing operations

  $ 0.22   $ 0.21   $ 0.17   $ 0.08  
                   
 

Net income attributable to COPT common shareholders

  $ 0.23   $ 0.22   $ 0.18   $ 0.08  
                   

Diluted earnings per share:

                         
 

Income from continuing operations

  $ 0.22   $ 0.21   $ 0.17   $ 0.08  
                   
 

Net income attributable to COPT common shareholders

  $ 0.23   $ 0.22   $ 0.18   $ 0.08  
                   

21. Commitments and Contingencies

Litigation

        In the normal course of business, we are involved in legal actions arising from our ownership and administration of properties. We establish reserves for specific legal proceedings when we determine that the likelihood of an unfavorable outcome is probable and the amount of loss can be reasonably estimated. Management does not anticipate that any liabilities that may result from such proceedings will have a materially adverse effect on our financial position, operations or liquidity. Our assessment of the potential outcomes of these matters involves significant judgment and is subject to change based on future developments.

        In 2005, a suit was initiated in the United States District Court for the District of Columbia against The Secretary of the United States Army, PenMar Development Corporation ("PMDC") and us, as defendants, in connection with our then pending acquisition of the former army base known as Fort Ritchie located in Cascade, Maryland. The case was dismissed by the United States District Court in 2006 due to the plaintiffs' lack of standing but upon the filing of an appeal, the findings of the District Court were reversed and the case remanded to the District Court for further proceedings. We subsequently acquired from PMDC fee simple title to 500 acres of the 591 acres comprising Fort Ritchie on October 5, 2006 and the remaining 91 acres on November 29, 2007.

        On November 10, 2009, the District Court issued an Order, together with a Memorandum Opinion, which precludes us from proceeding with the implementation of our development plan until

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

21. Commitments and Contingencies (Continued)

the Army either re-issues an amended Record of Environmental Consideration ("REC") or a Supplemental Environmental Impact Statement ("SEIS") that complies with the District Court's Memorandum Opinion. The Memorandum Opinion highlights various areas of the existing REC which could be revised to include greater detail on the Army's deliberative process whereby the Army determined that a SEIS was not necessary. We are working with both the Army's counsel and the Army representative on re-submission of the amended REC to the Court in order to lift the restrictions imposed by the Court.

        On January 8, 2010, the Army filed an appeal in the United States Court of Appeals for the District of Columbia Circuit, and, on January 19, 2011, the appeal was dismissed. On January 21, 2011, the District Court issued an order for the parties to meet and confer to provide a status report to the Court on or before February 4, 2011 and the Court has approved an extended filing date of February 18, 2011. In the event that this matter is not favorably resolved, we may be unable to execute our development plans for the property, which could render us unable to recover some or all of our investment made in the property. As of December 31, 2010, the carrying value of our investment in the property was $27.7 million.

Environmental

        We are subject to various Federal, state and local environmental regulations related to our property ownership and operation. We have performed environmental assessments of our properties, the results of which have not revealed any environmental liability that we believe would have a materially adverse effect on our financial position, operations or liquidity.

Joint Ventures

        In connection with our 2005 contribution of properties to an unconsolidated partnership in which we hold a limited partnership interest, we entered into standard nonrecourse loan guarantees (environmental indemnifications and guarantees against fraud and misrepresentation, including springing guarantees of partnership debt in the event of a voluntary bankruptcy of the partnership). The maximum amount we could be required to pay under the guarantees is approximately $66 million. We are entitled to recover 20% of any amounts paid under the guarantees from an affiliate of the general partner pursuant to an indemnity agreement so long as we continue to manage the properties. In the event that we no longer manage the properties, the percentage that we are entitled to recover is increased to 80%. Management estimates that the aggregate fair value of the guarantees is not material and would not exceed the amounts included in distributions received in excess of investment in unconsolidated real estate joint venture reported on the consolidated balance sheets.

        We are party to a contribution agreement that formed a joint venture relationship with a limited partnership to develop up to 1.8 million square feet of office space on 63 acres of land located in Hanover, Maryland. As we and the joint venture partner agree to proceed with the construction of buildings in the future, our joint venture partner would contribute land into newly-formed entities and we would make cash capital contributions into such entities to fund development and construction activities for which financing is not obtained. We owned a 50% interest in one such joint venture as of December 31, 2010.

        We may be required to make our pro rata share of additional investments in our real estate joint ventures (generally based on our percentage ownership) in the event that additional funds are needed.

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Corporate Office Properties Trust and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

21. Commitments and Contingencies (Continued)


In the event that the other members of these joint ventures do not pay their share of investments when additional funds are needed, we may then deem it appropriate to make even larger investments in these joint ventures.

Tax Incremental Financing Obligation

        In August 2010, Anne Arundel County, Maryland issued $30 million in tax incremental financing bonds to third-party investors in order to finance public improvements needed in connection with our project known as National Business Park North. The real estate taxes on increases in assessed value of a development district encompassing National Business Park North are to be transferred to a special fund pledged to the repayment of the bonds. We recognized a $3.5 million liability through December 31, 2010 representing the estimated fair value of our obligation to fund through a special tax any future shortfalls between debt service on the bonds and real estate taxes available to repay the bonds.

Ground Leases

        We are obligated as lessee under two ground leases that expire in 2099 and 2100. Future minimum rental payments due under the terms of these leases as of December 31, 2010 follow (in thousands):

Year Ending December 31,
   
 

2011

  $ 320  

2012

    320  

2013

    320  

2014

    320  

2015

    320  

Thereafter

    27,080  
       

  $ 28,680  
       

Environmental Indemnity Agreement

        We agreed to provide certain environmental indemnifications in connection with a lease of three New Jersey properties that we no longer own. The prior owner of the properties, a Fortune 100 company that is responsible for groundwater contamination at such properties, previously agreed to indemnify us for (1) direct losses incurred in connection with the contamination and (2) its failure to perform remediation activities required by the State of New Jersey, up to the point that the state declares the remediation to be complete. Under the lease agreement, we agreed to the following:

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Corporate Office Properties Trust
Schedule III—Real Estate and Accumulated Depreciation
December 31, 2010
(Dollars in Thousands)

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

100 Sentry Gateway (O)

  San Antonio, TX     6,752     1,178     9,191         1,178     9,191     10,369         (5 )   7/16/2008  

100 West Pennsylvania Avenue (O)

  Towson, MD         698     950     769     698     1,719     2,417     (220 )   1952/1989     1/10/2007  

10001 Franklin Square Drive (O)

  White Marsh, MD         4,033     11,483     762     4,033     12,245     16,278     (1,634 )   1997     1/9/2007  

10150 York Road (O)

  Hunt Valley, MD         2,700     11,623     5,564     2,700     17,187     19,887     (5,733 )   1985     4/15/2004  

102 West Pennsylvania Avenue (O)

  Towson, MD         1,090     3,182     845     1,090     4,027     5,117     (701 )   1968/2001     1/10/2007  

10270 Old Columbia Road (O)

  Columbia, MD     1,121     751     1,402     190     751     1,592     2,343     (297 )   1988/2001     1/9/2007  

10280 Old Columbia Road (O)

  Columbia, MD     1,138     756     1,431     130     756     1,561     2,317     (253 )   1988/2001     1/9/2007  

10290 Old Columbia Road (O)

  Columbia, MD     721     490     895     235     490     1,130     1,620     (228 )   1988/2001     1/9/2007  

1055 North Newport Road (O)

  Colorado Springs, CO         972     9,991         972     9,991     10,963     (706 )   2007-2008     5/19/2006  

10807 New Allegiance Drive (O)

  Colorado Springs, CO         1,840     25,251     60     1,840     25,311     27,151     (645 )   2009     9/28/2005  

109-111 Allegheny Avenue (O)

  Towson, MD         1,688     5,620     147     1,688     5,767     7,455     (746 )   1971     1/10/2007  

1099 Winterson Road (O)

  Linthicum, MD     12,012     1,323     5,293     2,136     1,323     7,429     8,752     (2,686 )   1988     4/30/1998  

110 Thomas Johnson Drive (O)

  Frederick, MD         2,810     12,075     799     2,810     12,874     15,684     (1,706 )   1987/1999     10/21/2005  

11011 McCormick Road (O)

  Hunt Valley, MD         875     3,474     1,635     875     5,109     5,984     (1,248 )   1974     12/22/2005  

1120 Vapor Trail (O)

  Colorado Springs, CO         1,291     1         1,291     1     1,292         (6 )   5/19/2006  

11311 McCormick Road (O)

  Hunt Valley, MD         2,308     21,310     5,811     2,308     27,121     29,429     (4,781 )   1984/1994     12/22/2005  

114 National Business Parkway (O)

  Annapolis Junction, MD         364     3,109     9     364     3,118     3,482     (723 )   2002     6/30/2000  

11751 Meadowville Lane (O)

  Richmond, VA     42,885     1,305     52,098     112     1,305     52,210     53,515     (4,668 )   2007     9/15/2006  

11800 Tech Road (O)

  Silver Spring, MD     16,016     4,574     19,703     2,349     4,574     22,052     26,626     (6,209 )   1989     8/1/2002  

1190 Winterson Road (O)

  Linthicum, MD     11,291     1,335     5,340     3,919     1,335     9,259     10,594     (4,522 )   1987     4/30/1998  

1199 Winterson Road (O)

  Linthicum, MD     18,578     1,599     6,395     2,832     1,599     9,227     10,826     (3,823 )   1988     4/30/1998  

1201 M Street (O)

  Washington, DC     38,261         49,785             49,785     49,785     (632 )   2001     9/1/2010  

1201 Winterson Road (O)

  Linthicum, MD         1,288     5,154     460     1,288     5,614     6,902     (1,747 )   1985     4/30/1998  

1220 12th Street, SE (O)

  Washington, DC     31,471         42,682     344         43,026     43,026     (422 )   2003     9/1/2010  

1243 Winterson Road (O)

  Linthicum, MD         630             630         630         (6 )   12/19/2001  

12515 Academy Ridge View (O)

  Colorado Springs, CO         2,612     7,260         2,612     7,260     9,872     (380 )   2006     6/26/2009  

1302 Concourse Drive (O)

  Linthicum, MD         2,078     8,313     2,325     2,078     10,638     12,716     (3,883 )   1996     11/18/1999  

1304 Concourse Drive (O)

  Linthicum, MD     9,621     1,999     12,934     362     1,999     13,296     15,295     (3,693 )   2002     11/18/1999  

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Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

1306 Concourse Drive (O)

  Linthicum, MD         2,796     11,186     1,887     2,796     13,073     15,869     (4,089 )   1990     11/18/1999  

131 National Business Parkway (O)

  Annapolis Junction, MD     7,168     1,906     7,623     1,802     1,906     9,425     11,331     (3,260 )   1990     9/28/1998  

132 National Business Parkway (O)

  Annapolis Junction, MD     28,264     2,917     12,259     2,275     2,917     14,534     17,451     (5,230 )   2000     5/28/1999  

13200 Woodland Park Road (O)

  Herndon, VA     63,659     10,428     41,711     13,760     10,428     55,471     65,899     (14,779 )   2002     6/2/2003  

133 National Business Parkway (O)

  Annapolis Junction, MD     9,591     2,517     10,068     4,183     2,517     14,251     16,768     (4,844 )   1997     9/28/1998  

1331 Ashton Road (O)

  Hanover, MD         587     2,347     311     587     2,658     3,245     (762 )   1989     4/28/1999  

1334 Ashton Road (O)

  Hanover, MD         736     2,946     2,173     736     5,119     5,855     (1,438 )   1989     4/28/1999  

134 National Business Parkway (O)

  Annapolis Junction, MD     19,200     3,684     7,517     1,621     3,684     9,138     12,822     (3,069 )   1999     11/13/1998  

1340 Ashton Road (O)

  Hanover, MD         905     3,620     894     905     4,514     5,419     (1,638 )   1989     4/28/1999  

1341 Ashton Road (O)

  Hanover, MD         306     1,223     421     306     1,644     1,950     (581 )   1989     4/28/1999  

1343 Ashton Road (O)

  Hanover, MD         193     774     405     193     1,179     1,372     (274 )   1989     4/28/1999  

1344 Ashton Road (O)

  Hanover, MD         355     1,421     384     355     1,805     2,160     (681 )   1989     4/28/1999  

13450 Sunrise Valley (O)

  Herndon, VA         1,386     5,576     1,818     1,386     7,394     8,780     (2,203 )   1998     7/25/2003  

13454 Sunrise Valley (O)

  Herndon, VA         2,899     11,986     2,271     2,899     14,257     17,156     (3,364 )   1998     7/25/2003  

1348 Ashton Road (R)

  Hanover, MD         50         40     50     40     90     (19 )   1988     4/28/1999  

135 National Business Parkway (O)

  Annapolis Junction, MD     10,272     2,484     9,750     1,522     2,484     11,272     13,756     (4,326 )   1998     12/30/1998  

1350 Dorsey Road (O)

  Hanover, MD         393     1,573     549     393     2,122     2,515     (712 )   1989     4/28/1999  

1362 Mellon Road (O)

  Hanover, MD         1,706     6,797         1,706     6,797     8,503     (456 )   2006     2/10/2006  

140 National Business Parkway (O)

  Annapolis Junction, MD         3,407     24,167     631     3,407     24,798     28,205     (4,380 )   2003     12/31/2003  

141 National Business Parkway (O)

  Annapolis Junction, MD     10,066     2,398     9,590     1,632     2,398     11,222     13,620     (3,590 )   1990     9/28/1998  

14280 Park Meadow Drive (O)

  Chantilly, VA         3,731     15,953     819     3,731     16,772     20,503     (3,440 )   1999     9/29/2004  

1460 Dorsey Road (O)

  Hanover, MD         2,141     45         2,141     45     2,186         (6 )   2/28/2006  

14840 Conference Center Drive (O)

  Chantilly, VA         1,572     8,175     31     1,572     8,206     9,778     (3,062 )   2000     7/25/2003  

14850 Conference Center Drive (O)

  Chantilly, VA         1,615     8,358     22     1,615     8,380     9,995     (3,100 )   2000     7/25/2003  

14900 Conference Center Drive (O)

  Chantilly, VA         3,436     14,402     2,623     3,436     17,025     20,461     (4,351 )   1999     7/25/2003  

15 Governor's Court (O)

  Woodlawn, MD         383     1,168         383     1,168     1,551     (238 )   1981     12/22/2005  

15 West Gude Drive (O)

  Rockville, MD         3,120     13,626     2,921     3,120     16,547     19,667     (2,996 )   1986     4/7/2005  

15000 Conference Center Drive (O)

  Chantilly, VA     54,000     5,193     47,180     12,031     5,193     59,211     64,404     (16,963 )   1989     11/30/2001  

1501 South Clinton Street (O)

  Baltimore, MD         35,264     49,609     276     35,264     49,885     85,149     (2,433 )   2006     10/27/2009  

15010 Conference Center Drive (O)

  Chantilly, VA     96,000     3,500     41,921     147     3,500     42,068     45,568     (4,392 )   2006     11/30/2001  

15049 Conference Center Drive (O)

  Chantilly, VA         4,415     20,365     704     4,415     21,069     25,484     (5,747 )   1997     8/14/2002  

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Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

15059 Conference Center Drive (O)

  Chantilly, VA     23,648     5,753     13,615     999     5,753     14,614     20,367     (4,011 )   2000     8/14/2002  

1550 West Nursery Road (O)

  Linthicum, MD         15,513     16,930         15,513     16,930     32,443     (686 )   2009     10/28/2009  

1550 Westbranch Dr (O)

  McLean, VA         5,595     26,212     97     5,595     26,309     31,904     (490 )   2002     6/28/2010  

1560A Cable Ranch Road (O)

  San Antonio, TX         1,097     3,770     6     1,097     3,776     4,873     (384 )   1985/2007     6/19/2008  

1560B Cable Ranch Road (O)

  San Antonio, TX         2,299     6,545     11     2,299     6,556     8,855     (650 )   1985/2006     6/19/2008  

16442 Commerce Drive (O)

  Dahlgren, VA     2,396     613     2,582     198     613     2,780     3,393     (499 )   2002     12/21/2004  

16444 Commerce Drive (O)

  Dahlgren, VA         317     671         317     671     988         2002     12/21/2004  

16480 Commerce Drive (O)

  Dahlgren, VA         1,856     7,425     164     1,856     7,589     9,445     (1,217 )   2000     12/28/2004  

16501 Commerce Drive (O)

  Dahlgren, VA     1,959     522     2,090     176     522     2,266     2,788     (440 )   2002     12/21/2004  

16539 Commerce Drive (O)

  Dahlgren, VA         688     2,860     1,370     688     4,230     4,918     (766 )   1990     12/21/2004  

16541 Commerce Drive (O)

  Dahlgren, VA         773     3,094     858     773     3,952     4,725     (744 )   1996     12/21/2004  

16543 Commerce Drive (O)

  Dahlgren, VA     1,633     436     1,742     1     436     1,743     2,179     (262 )   2002     12/21/2004  

1670 North Newport Road (O)

  Colorado Springs, CO     4,572     853     7,007     236     853     7,243     8,096     (1,196 )   1986/1987     9/30/2005  

17 Governor's Court (O)

  Woodlawn, MD         170     530     293     170     823     993     (151 )   1981     12/22/2005  

1751 Pinnacle Drive (O)

  McLean, VA     31,796     10,486     42,339     11,171     10,486     53,510     63,996     (11,716 )   1989/1995     9/23/2004  

1753 Pinnacle Drive (O)

  McLean, VA     25,659     8,275     34,353     8,339     8,275     42,692     50,967     (7,753 )   1976/2004     9/23/2004  

1915 Aerotech Drive (O)

  Colorado Springs, CO     3,394     556     3,094     471     556     3,565     4,121     (796 )   1985     6/8/2006  

1925 Aerotech Drive (O)

  Colorado Springs, CO     3,717     556     3,067     358     556     3,425     3,981     (487 )   1985     6/8/2006  

200 International Circle (O)

  Hunt Valley, MD         2,016     10,851     3,368     2,016     14,219     16,235     (2,582 )   1987     12/22/2005  

200 Sentry Gateway (O)

  San Antonio, TX             262             262     262         (5 )   7/16/2008  

201 International Circle (O)

  Hunt Valley, MD         1,552     6,071     2,072     1,552     8,143     9,695     (1,669 )   1982     12/22/2005  

201 Technology Drive (O)

  Lebanon, VA     21,431     726     31,091     60     726     31,151     31,877     (2,464 )   2007     10/5/2007  

202 Research Boulevard (O)

  Aberdeen, MD         1,862     2,289         1,862     2,289     4,151         (5 )   9/14/2007  

206 Research Boulevard (O)

  Aberdeen, MD         1,862     8,338         1,862     8,338     10,200         (5 )   9/14/2007  

209 Research Boulevard (O)

  Aberdeen, MD     12,973     1,045     15,059         1,045     15,059     16,104     (108 )   2010     9/14/2007  

21 Governor's Court (O)

  Woodlawn, MD         771     3,341     804     771     4,145     4,916     (707 )   1981/1995     12/22/2005  

210 Research Boulevard (O)

  Aberdeen, MD     9,639     1,065     11,963         1,065     11,963     13,028     (20 )   2010     9/14/2007  

216 Schilling Center (O)

  Hunt Valley, MD         825     3,684     102     825     3,786     4,611     (447 )   1988/2001     1/10/2007  

222 Schilling Circle (O)

  Hunt Valley, MD         754     2,465     423     754     2,888     3,642     (364 )   1978/1997     1/10/2007  

22289 Exploration Drive (O)

  Lexington Park, MD         1,422     5,719     681     1,422     6,400     7,822     (1,364 )   2000     3/24/2004  

22299 Exploration Drive (O)

  Lexington Park, MD         1,362     5,791     490     1,362     6,281     7,643     (1,507 )   1998     3/24/2004  

22300 Exploration Drive (O)

  Lexington Park, MD         1,094     5,038     160     1,094     5,198     6,292     (1,169 )   1997     11/9/2004  

22309 Exploration Drive (O)

  Lexington Park, MD         2,243     10,419     192     2,243     10,611     12,854     (2,660 )   1984/1997     3/24/2004  

224 Schilling Circle (O)

  Hunt Valley, MD         734     2,423     809     734     3,232     3,966     (482 )   1978/1997     1/10/2007  

226 Schilling Circle (O)

  Hunt Valley, MD         1,877     9,891     232     1,877     10,123     12,000     (1,876 )   1980     12/22/2005  

23535 Cottonwood Parkway (O)

  California, MD         763     3,051     192     763     3,243     4,006     (533 )   1984     3/24/2004  

2500 Riva Road (O)

  Annapolis, MD         2,791     12,145     1     2,791     12,146     14,937     (2,696 )   2000     3/4/2003  

2691 Technology Drive (O)

  Annapolis Junction, MD     24,000     2,098     17,334     1,303     2,098     18,637     20,735     (2,344 )   2005     5/26/2000  

2701 Technology Drive (O)

  Annapolis Junction, MD     14,277     1,737     15,266     45     1,737     15,311     17,048     (4,562 )   2001     5/26/2000  

2711 Technology Drive (O)

  Annapolis Junction, MD     20,036     2,251     21,611     433     2,251     22,044     24,295     (6,319 )   2002     11/13/2000  

2720 Technology Drive (O)

  Annapolis Junction, MD     24,923     3,863     29,272     36     3,863     29,308     33,171     (4,636 )   2004     1/31/2002  

2721 Technology Drive (O)

  Annapolis Junction, MD     28,264     4,611     14,597     33     4,611     14,630     19,241     (4,063 )   2000     10/21/1999  

2730 Hercules Road (O)

  Annapolis Junction, MD     33,880     8,737     31,612     1,749     8,737     33,361     42,098     (9,834 )   1990     9/28/1998  

F-58


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

2900 Towerview Road (O)

  Herndon, VA         3,207     16,337     1,524     3,207     17,861     21,068     (2,513 )   1982/2008     12/20/2005  

300 Sentinel Drive (O)

  Annapolis Junction, MD     30,440     1,517     53,782     119     1,517     53,901     55,418     (1,286 )   2009     11/14/2003  

302 Sentinel Drive (O)

  Annapolis Junction, MD     23,500     2,648     29,405     257     2,648     29,662     32,310     (2,136 )   2007     11/14/2003  

304 Sentinel Drive (O)

  Annapolis Junction, MD     37,280     3,411     24,917     105     3,411     25,022     28,433     (3,071 )   2005     11/14/2003  

306 Sentinel Drive (O)

  Annapolis Junction, MD     21,707     3,260     22,592     60     3,260     22,652     25,912     (2,402 )   2006     11/14/2003  

308 Sentinel Drive (O)

  Annapolis Junction, MD     15,628     1,386     19,065         1,386     19,065     20,451         2010     11/14/2003  

310 Sentinel Way (O)

  Annapolis Junction, MD         2,372     1,089         2,372     1,089     3,461         (5 )   11/14/2003  

312 Sentinel Way (O)

  Annapolis Junction, MD         3,138     3,089         3,138     3,089     6,227         (5 )   11/14/2003  

3120 Fairview Park Drive (O)

  Herndon, VA         6,863     35,556         6,863     35,556     42,419     (76 )   2008(5 )   11/23/2010  

314 Sentinel Way (O)

  Annapolis Junction, MD         1,254     1,331         1,254     1,331     2,585     (83 )   2008     11/14/2003  

316 Sentinel Way (O)

  Annapolis Junction, MD     15,551     2,748     23,905         2,748     23,905     26,653         (5 )   11/14/2003  

318 Sentinel Way (O)

  Annapolis Junction, MD     23,030     2,185     28,426         2,185     28,426     30,611     (3,427 )   2005     11/14/2003  

320 Sentinel Way (O)

  Annapolis Junction, MD     19,209     2,067     21,625         2,067     21,625     23,692     (1,607 )   2007     11/14/2003  

322 Sentinel Way (O)

  Annapolis Junction, MD     22,679     2,605     22,812         2,605     22,812     25,417     (2,290 )   2006     11/14/2003  

324 Sentinel Way (O)

  Annapolis Junction, MD     17,515     1,656     21,356         1,656     21,356     23,012     (262 )   2010     6/29/2006  

3535 Northrop Grumman Point (O)

  Colorado Springs, CO     18,611         22,163     96         22,259     22,259     (1,964 )   2008     6/10/2008  

37 Allegheny Avenue (O)

  Towson, MD         504             504         504         (6 )   1/9/2007  

375 West Padonia Road (O)

  Timonium, MD         2,483     10,415     1,818     2,483     12,233     14,716     (3,751 )   1986     12/21/1999  

400 Professional Drive (O)

  Gaithersburg, MD     15,137     3,673     16,826     1,003     3,673     17,829     21,502     (5,219 )   2000     3/5/2004  

410 National Business Parkway (O)

  Annapolis Junction, MD             1,760             1,760     1,760         (5 )   6/29/2003  

4230 Forbes Boulevard (O)

  Lanham, MD         511     4,346         511     4,346     4,857     (1,553 )   2003     12/24/2002  

430 National Business Parkway (O)

  Annapolis Junction, MD         1,852     6,498         1,852     6,498     8,350         (5 )   6/29/2006  

44408 Pecan Court (O)

  California, MD         817     3,269     103     817     3,372     4,189     (570 )   1986     3/24/2004  

44414 Pecan Court (O)

  California, MD         405     1,619     160     405     1,779     2,184     (329 )   1986     3/24/2004  

44417 Pecan Coirt (O)

  California, MD         434     1,939     18     434     1,957     2,391     (501 )   1989     3/24/2004  

44420 Pecan Court (O)

  California, MD         344     1,374     126     344     1,500     1,844     (235 )   1989     11/9/2004  

44425 Pecan Court (O)

  California, MD         1,309     5,234     690     1,309     5,924     7,233     (1,155 )   1997     5/5/2004  

45 West Gude Drive (O)

  Rockville, MD         3,102     15,267     388     3,102     15,655     18,757     (3,137 )   1987     4/7/2005  

45310 Abell House Lane (O)

  California, MD         2,265     3,485         2,265     3,485     5,750         (5 )   8/30/2010  

46579 Expedition Drive (O)

  Lexington Park, MD         1,406     5,796     945     1,406     6,741     8,147     (1,575 )   2002     3/24/2004  

46591 Expedition Drive (O)

  Lexington Park, MD         1,200     7,199     138     1,200     7,337     8,537     (712 )   2005-2006     3/24/2004  

4851 Stonecroft Boulevard (O)

  Chantilly, VA     16,405     1,878     11,558     21     1,878     11,579     13,457     (1,800 )   2004     8/14/2002  

4940 Campbell Drive (O)

  White Marsh, MD         1,379     3,858     700     1,379     4,558     5,937     (593 )   1990     1/9/2007  

4969 Mercantile Road (O)

  White Marsh, MD         1,308     4,456     62     1,308     4,518     5,826     (449 )   1983     1/9/2007  

4979 Mercantile Road (O)

  White Marsh, MD         1,299     4,686     70     1,299     4,756     6,055     (485 )   1985     1/9/2007  

502 Washington Avenue (O)

  Towson, MD     4,808     826     7,023     1,657     826     8,680     9,506     (1,591 )   1984     1/9/2007  

5020 Campbell Boulevard (O)

  White Marsh, MD         1,014     3,136     88     1,014     3,224     4,238     (458 )   1986-1988     1/9/2007  

5022 Campbell Boulevard (O)

  White Marsh, MD         624     1,924     133     624     2,057     2,681     (310 )   1986-1988     1/9/2007  

5024 Campbell Boulevard (O)

  White Marsh, MD         767     2,420     218     767     2,638     3,405     (500 )   1986-1988     1/9/2007  

F-59


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

5026 Campbell Boulevard (O)

  White Marsh, MD         700     2,138     7     700     2,145     2,845     (293 )   1986-1988     1/9/2007  

525 Babcock Road (O)

  Colorado Springs, CO         355     974         355     974     1,329     (132 )   1967     7/12/2007  

5325 Nottingham Drive (O)

  White Marsh, MD         816     3,976     137     816     4,113     4,929     (468 )   2002     1/9/2007  

5355 Nottingham Drive (O)

  White Marsh, MD         761     3,562     1,280     761     4,842     5,603     (387 )   2005     1/9/2007  

5520 Research Park Drive (O)

  Catonsville, MD             18,348             18,348     18,348     (710 )   2009     4/4/2006  

5522 Research Park Drive (O)

  Catonsville, MD             4,550             4,550     4,550     (387 )   2007     3/8/2006  

565 Space Center Drive (O)

  Colorado Springs, CO         644     12,720         644     12,720     13,364     (243 )   2009     7/8/2005  

5725 Mark Dabling Blvd. (O)

  Colorado Springs, CO     12,882     900     11,397     2,363     900     13,760     14,660     (3,115 )   1984     5/18/2006  

5755 Mark Dabling Boulevard (O)

  Colorado Springs, CO     10,208     799     10,324     2,227     799     12,551     13,350     (2,202 )   1989     5/18/2006  

5775 Mark Dabling Boulevard (O)

  Colorado Springs, CO     12,477     1,035     12,440     609     1,035     13,049     14,084     (3,195 )   1984     5/18/2006  

5825 University Research Court (O)

  College Park, MD     16,910         21,839             21,839     21,839     (1,049 )   2008     1/29/2008  

5850 University Research Court (O)

  College Park, MD     23,025         30,024             30,024     30,024     (731 )   2009     1/29/2008  

655 Space Center Drive (O)

  Colorado Springs, CO     14,944     745     17,668     13     745     17,681     18,426     (1,183 )   2008     7/8/2005  

6700 Alexander Bell Drive (O)

  Columbia, MD     4,000     1,755     7,019     3,520     1,755     10,539     12,294     (3,836 )   1988     5/14/2001  

6708 Alexander Bell Drive (O)

  Columbia, MD     6,320     897     3,588     1,580     897     5,168     6,065     (1,954 )   1988     5/14/2001  

6711 Columbia Gateway Drive (O)

  Columbia, MD     23,391     2,683     22,557     117     2,683     22,674     25,357     (2,299 )   2006-2007     9/28/2000  

6716 Alexander Bell Drive (O)

  Columbia, MD         1,242     4,969     1,852     1,242     6,821     8,063     (2,861 )   1990     12/31/1998  

6721 Columbia Gateway Drive (O)

  Columbia, MD     30,276     1,753     34,090         1,753     34,090     35,843     (1,529 )   2009     9/28/2000  

6724 Alexander Bell Drive (O)

  Columbia, MD     10,939     449     5,039     161     449     5,200     5,649     (1,434 )   2001     5/14/2001  

6731 Columbia Gateway Drive (O)

  Columbia, MD     20,143     2,807     18,975     1,121     2,807     20,096     22,903     (5,012 )   2002     3/29/2000  

6740 Alexander Bell Drive (O)

  Columbia, MD         1,424     5,696     2,850     1,424     8,546     9,970     (3,264 )   1992     12/31/1998  

6741 Columbia Gateway Drive (O)

  Columbia, MD         675     1,718     114     675     1,832     2,507     (88 )   2008     9/28/2000  

6750 Alexander Bell Drive (O)

  Columbia, MD         1,263     12,461     1,870     1,263     14,331     15,594     (4,860 )   2001     12/31/1998  

6760 Alexander Bell Drive (O)

  Columbia, MD         890     3,561     1,677     890     5,238     6,128     (2,259 )   1991     12/31/1998  

6940 Columbia Gateway Drive (O)

  Columbia, MD     17,300     3,545     9,916     2,560     3,545     12,476     16,021     (4,256 )   1999     11/13/1998  

6950 Columbia Gateway Drive (O)

  Columbia, MD     14,039     3,596     14,269     936     3,596     15,205     18,801     (5,155 )   1998     10/22/1998  

F-60


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

7000 Columbia Gateway Drive (O)

  Columbia, MD     15,800     3,131     12,103     153     3,131     12,256     15,387     (2,571 )   1999     5/31/2002  

7015 Albert Einstein Drive (O)

  Columbia, MD     2,987     2,058     6,093     826     2,058     6,919     8,977     (1,689 )   1999     12/1/2005  

7061 Columbia Gateway Drive (O)

  Columbia, MD     2,359     729     3,094     560     729     3,654     4,383     (1,137 )   2000     8/30/2001  

7063 Columbia Gateway Drive (O)

  Columbia, MD     2,830     902     3,684     1,035     902     4,719     5,621     (1,756 )   2000     8/30/2001  

7065 Columbia Gateway Drive (O)

  Columbia, MD     2,745     919     3,763     927     919     4,690     5,609     (1,527 )   2000     8/30/2001  

7067 Columbia Gateway Drive (O)

  Columbia, MD     8,003     1,829     11,823     1,779     1,829     13,602     15,431     (3,207 )   2001     8/30/2001  

7102 Ambassador Road (O)

  Woodlawn, MD         277     203     209     277     412     689     (60 )   1988     12/22/2005  

7104 Ambassador Road (O)

  Woodlawn, MD         572     613     445     572     1,058     1,630     (367 )   1988     12/22/2005  

7106 Ambassador Road (O)

  Woodlawn, MD         229     306     7     229     313     542     (53 )   1988     12/22/2005  

7108 Ambassador Road (O)

  Woodlawn, MD         171     252     117     171     369     540     (50 )   1988     12/22/2005  

7125 Ambassador Road (O)

  Woodlawn, MD         844     1,896     224     844     2,120     2,964     (538 )   1985     12/22/2005  

7125 Columbia Gateway Drive (O)

  Columbia, MD     35,258     20,487     47,054     2,887     20,487     49,941     70,428     (7,293 )   1973/1999     6/29/2006  

7127 Ambassador Road (O)

  Woodlawn, MD         142     455     221     142     676     818     (184 )   1985     12/22/2005  

7129 Ambassador Road (O)

  Woodlawn, MD         129     610     294     129     904     1,033     (370 )   1985     12/22/2005  

7130 Columbia Gateway Drive (O)

  Columbia, MD     6,519     1,350     4,359     1,764     1,350     6,123     7,473     (844 )   1989     9/19/2005  

7131 Ambassador Road (O)

  Woodlawn, MD         105     368     282     105     650     755     (229 )   1985     12/22/2005  

7134 Columbia Gateway Drive (O)

  Columbia, MD     2,949     704     1,971     6     704     1,977     2,681     (396 )   1990     9/19/2005  

7138 Columbia Gateway Drive (O)

  Columbia, MD     5,406     1,104     3,518     1,961     1,104     5,479     6,583     (1,530 )   1990     9/19/2005  

7142 Columbia Gateway Drive (O)

  Columbia, MD     6,280     1,342     3,978     1,326     1,342     5,304     6,646     (888 )   1994     9/19/2005  

7150 Columbia Gateway Drive (O)

  Columbia, MD     4,850     1,032     3,429     207     1,032     3,636     4,668     (680 )   1991     9/19/2005  

7150 Riverwood Drive (O)

  Columbia, MD     4,879     1,821     4,388     165     1,821     4,553     6,374     (618 )   2000     1/10/2007  

7152 Windsor Boulevard (O)

  Woodlawn, MD         879     6,764     187     879     6,951     7,830     (1,039 )   1986     12/22/2005  

7160 Riverwood Drive (O)

  Columbia, MD     7,652     2,732     7,006     1,102     2,732     8,108     10,840     (1,899 )   2000     1/10/2007  

7170 Riverwood Drive (O)

  Columbia, MD     3,441     1,283     3,096     162     1,283     3,258     4,541     (435 )   2000     1/10/2007  

7175 Riverwood Drive (O)

  Columbia, MD         1,788     956         1,788     956     2,744     (103 )   1996     7/27/2005  

7200 Riverwood Road (O)

  Columbia, MD         4,089     16,356     2,348     4,089     18,704     22,793     (5,602 )   1986     10/13/1998  

7205 Riverwood Drive (O)

  Columbia, MD         1,367     2,787         1,367     2,787     4,154         (5 )   7/27/2005  

7210 Ambassador Road (O)

  Woodlawn, MD         1,481     6,257     241     1,481     6,498     7,979     (1,501 )   1972     12/22/2005  

7240 Parkway Drive (O)

  Hanover, MD         1,496     5,985     2,678     1,496     8,663     10,159     (2,929 )   1985     4/18/2000  

7272 Park Circle Drive (O)

  Hanover, MD     5,509     1,479     6,300     1,262     1,479     7,562     9,041     (1,022 )   1991/1996     1/10/2007  

7318 Parkway Drive (O)

  Hanover, MD         972     3,888     785     972     4,673     5,645     (1,316 )   1984     4/16/1999  

7320 Parkway Drive (O)

  Hanover, MD     7,000     905     3,570     1,140     905     4,710     5,615     (1,197 )   1983     4/4/2002  

745 Space Center Drive (O)

  Colorado Springs, CO     7,667     654     10,003     3     654     10,006     10,660     (1,088 )   2006     7/8/2005  

7467 Ridge Road (O)

  Hanover, MD         1,629     6,517     1,609     1,629     8,126     9,755     (2,783 )   1990     4/28/1999  

7468 Candlewood Drive (O)

  Hanover, MD         5,599     34,713     3     5,599     34,716     40,315         1979/1982(5 )   12/20/2005  

F-61


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

7700 Potranco Road (O)

  San Antonio, TX         14,020     38,611     7     14,020     38,618     52,638     (3,765 )   1982/1985     3/30/2005  

7700-1 Potranco Road (O)

  San Antonio, TX             1,066             1,066     1,066     (55 )   2007     3/30/2005  

7700-5 Potranco Road (O)

  San Antonio, TX             1,884             1,884     1,884     (60 )   2009     3/30/2005  

7740 Milestone Parkway (O)

  Hanover, MD     16,753     3,825     25,148         3,825     25,148     28,973     (956 )   2009     7/2/2007  

7770 Backlick Road (O)

  Springfield, VA             64             64     64         (5 )   3/10/2010  

7923 Honeygo Boulevard (O)

  White Marsh, MD         715     1,906     175     715     2,081     2,796     (341 )   1985     1/10/2007  

7939 Honeygo Boulevard (O)

  White Marsh, MD         869     2,716     139     869     2,855     3,724     (444 )   1984     1/10/2007  

7941-7949 Corporate Drive (O)

  White Marsh, MD         2,087     3,782     12     2,087     3,794     5,881     (497 )   1996     1/9/2007  

800 International Drive (O)

  Linthicum, MD     8,408     775     3,099     909     775     4,008     4,783     (1,399 )   1988     4/30/1998  

8000 Potranco Road (O)

  San Antonio, TX     16,702     1,964     19,147         1,964     19,147     21,111     (149 )   2010     1/20/2006  

8003 Corporate Drive (O)

  White Marsh, MD         611     1,611     48     611     1,659     2,270     (224 )   1999     1/9/2007  

8007 Corporate Drive (O)

  White Marsh, MD         1,434     3,336     179     1,434     3,515     4,949     (540 )   1995     1/9/2007  

8010 Corporate Drive (O)

  White Marsh, MD         1,349     3,262     1,588     1,349     4,850     6,199     (422 )   1998     1/9/2007  

8013 Corporate Drive (O)

  White Marsh, MD     1,364     642     1,536     219     642     1,755     2,397     (273 )   1990     1/9/2007  

8015 Corporate Drive (O)

  White Marsh, MD     980     446     1,116     111     446     1,227     1,673     (211 )   1990     1/9/2007  

8019 Corporate Drive (O)

  White Marsh, MD     1,617     680     1,898     96     680     1,994     2,674     (385 )   1990     1/9/2007  

8020 Corporate Drive (O)

  White Marsh, MD         2,184     3,767     2,053     2,184     5,820     8,004     (412 )   1997     1/9/2007  

8023 Corporate Drive (O)

  White Marsh, MD     1,413     651     1,603         651     1,603     2,254     (178 )   1990     1/9/2007  

8029 Corporate Drive (O)

  White Marsh, MD     5,637     962     2,719         962     2,719     3,681     (419 )   1988/2004     1/9/2007  

8030 Potranco Road (O)

  San Antonio, TX     17,140     1,964     19,287         1,964     19,287     21,251     (151 )   2010     1/20/2006  

8031 Corporate Drive (O)

  White Marsh, MD     5,637     2,548     6,975         2,548     6,975     9,523     (980 )   1988/2004     1/9/2007  

8094 Sandpiper Circle (O)

  White Marsh, MD         1,960     3,716     206     1,960     3,922     5,882     (576 )   1998     1/9/2007  

8098 Sandpiper Circle (O)

  White Marsh, MD         1,797     3,651     46     1,797     3,697     5,494     (368 )   1998     1/9/2007  

8100 Potranco Road (O)

  San Antonio, TX         1,964     1,360         1,964     1,360     3,324         (5 )   6/14/2005  

8110 Corporate Drive (O)

  White Marsh, MD     11,956     2,285     10,117     29     2,285     10,146     12,431     (1,464 )   2001     1/9/2007  

8114 Sandpiper Circle (O)

  White Marsh, MD         1,634     4,277     1,217     1,634     5,494     7,128     (758 )   1986     1/9/2007  

8120 Corporate Drive (O)

  White Marsh, MD         2,017     541         2,017     541     2,558         (6 )   1/9/2007  

8130 Corporate Drive (O)

  White Marsh, MD         2,017     2,256         2,017     2,256     4,273         (6 )   1/9/2007  

8133 Perry Hall Boulevard (O)

  White Marsh, MD         850     2,429     325     850     2,754     3,604     (444 )   1988     1/10/2007  

8140 Corporate Drive (O)

  White Marsh, MD     11,181     2,158     8,457     1,724     2,158     10,181     12,339     (2,036 )   2003     1/9/2007  

849 International Drive (O)

  Linthicum, MD     11,692     1,356     5,426     2,681     1,356     8,107     9,463     (3,437 )   1988     2/23/1999  

8615 Ridgely's Choice (O)

  White Marsh, MD         1,078     3,613     621     1,078     4,234     5,312     (648 )   2005     1/9/2007  

8621 Robert Fulton Drive (O)

  Columbia, MD     11,000     2,317     12,642     199     2,317     12,841     15,158     (1,622 )   2005-2006     6/10/2005  

8661 Robert Fulton Drive (O)

  Columbia, MD     6,200     1,510     3,764     1,026     1,510     4,790     6,300     (1,181 )   2002     12/30/2003  

8671 Robert Fulton Drive (O)

  Columbia, MD     7,600     1,718     4,280     1,670     1,718     5,950     7,668     (1,514 )   2002     12/30/2003  

880 Elkridge Landing Road (O)

  Linthicum, MD     18,900     2,003     9,442     6,689     2,003     16,131     18,134     (6,243 )   1981     8/3/2001  

881 Elkridge Landing Road (O)

  Linthicum, MD     11,812     1,034     4,137     1,057     1,034     5,194     6,228     (1,638 )   1986     4/30/1998  

891 Elkrdige Landing Road (O)

  Linthicum, MD         1,160     4,750     1,739     1,160     6,489     7,649     (2,083 )   1984     7/2/2001  

F-62


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

900 Elkridge Landing Road (O)

  Linthicum, MD         1,993     7,972     2,445     1,993     10,417     12,410     (3,798 )   1982     4/30/1998  

900 International Drive (O)

  Linthicum, MD     8,008     981     3,922     834     981     4,756     5,737     (1,577 )   1986     4/30/1998  

901 Elkridge Landing Road (O)

  Linthicum, MD         1,151     4,416     1,192     1,151     5,608     6,759     (1,730 )   1984     7/2/2001  

9020 Mendenhall Court (O)

  Columbia, MD         1,233     4,571     392     1,233     4,963     6,196     (810 )   1982/2005     1/9/2007  

911 Elkridge Landing Road (O)

  Linthicum, MD         1,215     4,861     1,998     1,215     6,859     8,074     (2,340 )   1985     4/30/1998  

9130 Guilford Road (O)

  Columbia, MD     798     230     939     101     230     1,040     1,270     (299 )   1984     4/4/2002  

9140 Guilford Road (O)

  Columbia, MD     2,733     794     3,209     756     794     3,965     4,759     (1,150 )   1983     4/4/2002  

9150 Guilford Road (O)

  Columbia, MD     1,100     319     1,291     318     319     1,609     1,928     (506 )   1984     4/4/2002  

9160 Guilford Road (O)

  Columbia, MD     2,287     665     2,686     1,203     665     3,889     4,554     (1,645 )   1984     4/4/2002  

920 Elkridge Landing Road (O)

  Linthicum, MD     7,287     2,101     9,765     687     2,101     10,452     12,553     (3,564 )   1982     7/2/2001  

921 Elkridge Landing Road (O)

  Linthicum, MD         1,044     4,176     639     1,044     4,815     5,859     (1,739 )   1983     4/30/1998  

930 International Drive (O)

  Linthicum, MD     8,488     1,013     4,053     912     1,013     4,965     5,978     (1,722 )   1986     4/30/1998  

938 Elkridge Landing Road (O)

  Linthicum, MD     4,045     1,204     4,727     346     1,204     5,073     6,277     (1,246 )   1984     7/2/2001  

939 Elkridge Landing Road (O)

  Linthicum, MD         939     3,756     1,408     939     5,164     6,103     (2,065 )   1983     4/30/1998  

940 Elkridge Landing Road (O)

  Linthicum, MD     3,071     1,100     4,705     170     1,100     4,875     5,975     (1,081 )   1984     7/2/2001  

9651 Hornbaker Road (D)

  Manassas, VA         6,050     119,586         6,050     119,586     125,636     (173 )   2010     9/14/2010  

9690 Deereco Road (O)

  Timonium, MD         3,415     13,723     4,361     3,415     18,084     21,499     (6,665 )   1988     12/21/1999  

9700 Patuxent Woods Drive (O)

  Columbia, MD     2,057     1,329     2,621     314     1,329     2,935     4,264     (490 )   1986/2001     1/9/2007  

9710 Patuxent Woods Drive (O)

  Columbia, MD     993     648     1,260     215     648     1,475     2,123     (237 )   1986/2001     1/9/2007  

9720 Patuxent Woods Drive (O)

  Columbia, MD     2,712     1,701     3,508     174     1,701     3,682     5,383     (677 )   1986/2001     1/9/2007  

9730 Patuxent Woods Drive (O)

  Columbia, MD     2,095     1,318     2,707     143     1,318     2,850     4,168     (541 )   1986/2001     1/9/2007  

9740 Patuxent Woods Drive (O)

  Columbia, MD     2,515     1,628     3,201     755     1,628     3,956     5,584     (615 )   1986/2001     1/9/2007  

980 Technology Court (O)

  Colorado Springs, CO         526     2,046     341     526     2,387     2,913     (449 )   1995     9/28/2005  

985 Space Center Drive (O)

  Colorado Springs, CO         777     12,287     1,032     777     13,319     14,096     (2,081 )   1989     9/28/2005  

9900 Franklin Square Drive (O)

  White Marsh, MD         979     3,466     44     979     3,510     4,489     (493 )   1999     1/9/2007  

9910 Franklin Square Drive (O)

  White Marsh, MD     5,352     1,219     6,590     25     1,219     6,615     7,834     (969 )   2005     1/9/2007  

9920 Franklin Square Drive (O)

  White Marsh, MD         1,058     5,293     1,043     1,058     6,336     7,394     (857 )   2006     1/9/2007  

9925 Federal Drive (O)

  Colorado Springs, CO         1,129     7,042     17     1,129     7,059     8,188     (413 )   2008     9/28/2005  

9930 Franklin Square Drive (O)

  White Marsh, MD         1,137     3,921     9     1,137     3,930     5,067     (571 )   2001     1/9/2007  

F-63


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

9940 Franklin Square Drive (O)

  White Marsh, MD         1,052     3,382     281     1,052     3,663     4,715     (447 )   2000     1/9/2007  

9945 Federal Drive (O)

  Colorado Springs, CO         1,854     6,864         1,854     6,864     8,718     (257 )   2009     9/28/2005  

9950 Federal Drive (O)

  Colorado Springs, CO         877     5,045     671     877     5,716     6,593     (1,464 )   2001     12/22/2005  

9960 Federal Drive (O)

  Colorado Springs, CO         695     3,830     126     695     3,956     4,651     (621 )   2001     12/22/2005  

9965 Federal Drive (O)

  Colorado Springs, CO         1,401     6,061     519     1,401     6,580     7,981     (602 )   1983/2007     1/19/2006  

9965 Federal Drive Land (O)

  Colorado Springs, CO         466             466         466         (6 )   12/22/2005  

999 Corporate Boulevard (O)

  Linthicum, MD     13,530     1,187     8,332     484     1,187     8,816     10,003     (2,619 )   2000     8/1/1999  

Arborcrest Business Park (O)

  Blue Bell, PA         22,481     124,951     1,054     22,481     126,005     148,486     (29,620 )   1991-1996(5 )   10/14/1997  

Arundel Preserve (O)

  Hanover, MD             4,702             4,702     4,702         (6 )   (7 )

Canton Crossing Land Parcel (O)

  Baltimore, MD         16,085     76         16,085     76     16,161         (6 )   10/27/2009  

Columbia Gateway Parcel T-11 (O)

  Columbia, MD         6,387     2,910         6,387     2,910     9,297         (6 )   9/20/2004  

Commons at Nottingham Ridge (O)

  White Marsh, MD         12,017     2,490         12,017     2,490     14,507         (6 )   1/9/2007  

Dahlgren Land Parcel (O)

  Dahlgren, VA         910     226         910     226     1,136         (6 )   3/16/2005  

Expedition VII (O)

  Lexington Park, MD         705     733         705     733     1,438         (6 )   3/24/2004  

Fort Ritchie (M)

  Cascade, MD         4,798     22,489     493     4,798     22,982     27,780     (93 )   Various(5)(8)     10/5/2006  

Indian Head (O)

  Bryans Road, MD         5,822     1,606         5,822     1,606     7,428         (6 )   10/23/2006  

InterQuest Land Parcel (O)

  Colorado Springs, CO         19,043     9,616         19,043     9,616     28,659         (6 )   9/28/2005  

4985 Mercantile Road (O)

  White Marsh, MD         1,177     11         1,177     11     1,188         (6 )   1/9/2007  

M Square Research Park (O)

  College Park, MD             2,405             2,405     2,405         (5 )   1/29/2008  

Cedar Knolls (O)

  Annapolis Junction, MD             1,151             1,151     1,151         (5 )   11/14/2003  

National Business Park North (O)

  Annapolis Junction, MD         28,350     21,233         28,350     21,233     49,583         (6 )   6/29/2006  

North Gate Business Park (O)

  Aberdeen, MD         4,575     6,888         4,575     6,888     11,463         (6 )   9/14/2007  

Nottingham Ridge (O)

  White Marsh, MD         12,087     5,105         12,087     5,105     17,192         (6 )   1/9/2007  

Old Annapolis Road (O)

  Columbia, MD         1,637     5,500     2,103     1,637     7,603     9,240     (1,892 )   1974/1985     12/14/2000  

Patriot Park (O)

  Colorado Springs, CO         8,768     9,147         8,768     9,147     17,915         (6 )   7/12/2007  

Patriot Ridge (O)

  Springfield, VA         24,812     2,675         24,812     2,675     27,487         (6 )   3/10/2010  

Philadelphia Road & Route 43 (O)

  White Marsh, MD         1,008     343         1,008     343     1,351         (6 )   1/9/2007  

Redstone Gateway (O)

  Huntsville, AL             14,634             14,634     14,634         (5 )   3/23/2010  

Rockville Corporate Center (O)

  Rockville, MD         6,244     3,656         6,244     3,656     9,900         (6 )   4/7/2005  

Sentry Gateway (O)

  San Antonio, TX         16,890     4,540         16,890     4,540     21,430         (6 )   3/30/2005  

Thatcher Farm (O)

  Frederick, MD         8,703     472         8,703     472     9,175         (6 )   8/28/2008  

Thomas Johnson Drive Land (O)

  Frederick, MD         1,092     1,207         1,092     1,207     2,299         (6 )   10/21/2005  

Waterview III (O)

  Herndon, VA         9,614     81         9,614     81     9,695         (6 )   4/29/2004  

F-64


Table of Contents

 
   
   
   
   
   
  Gross Amounts Carried
At Close of Period
   
   
   
 
 
   
   
  Initial Cost    
   
   
   
 
 
   
   
  Costs
Capitalized
Subsequent to
Acquisition
   
   
   
 
Property (Type)(1)
  Location   Encumbrances(2)   Land   Building
and Land
Improvements
  Land   Building
and Land
Improvements
  Total(3)   Accumulated
Depreciation(4)
  Year Built or
Renovated
  Date
Acquired
 

Westfields Corporate Center (O)

  Chantilly, VA         10,750     3,971         10,750     3,971     14,721         (6 )   Various  

White Marsh Commerce Center II (O)

  White Marsh, MD         1,613     66         1,613     66     1,679         (6 )   1/9/2007  

Other Developments, including intercompany eliminations (V)

  Various         7     (119 )   257     7     138     145     159     Various     Various  
                                                   

      $ 1,639,835   $ 757,697   $ 2,947,874   $ 242,916   $ 757,697   $ 3,190,790   $ 3,948,487   $ (503,032 )            
                                                   

(1)
A legend for the Property Type follows: (O) = Office Property; (D) = Data Center; (R) = Retail Property; (M) = Mixed-Use Property; and (V) = Various.

(2)
Excludes our unsecured Revolving Credit Facility of $295.0 million, senior exchangeable notes of $383.7 million, unsecured notes payable of $1.9 million, and net premiums on the remaining loans of $3.2 million.

(3)
The aggregate cost of these assets for Federal income tax purposes was approximately $3.6 billion at December 31, 2010.

(4)
The estimated lives over which depreciation is recognized follow: Buildings improvements: 10-40 years; and tenant improvements: related lease terms.

(5)
Under construction, development or redevelopment at December 31, 2010.

(6)
Held for future development at December 31, 2010.

(7)
Development in progress in anticipation of acquisition.

(8)
Includes residential housing units and commercial buildings, as well as commercial assets under development.

F-65


Table of Contents

        The following table summarizes our changes in cost of properties for the years ended December 31, 2010, 2009 and 2008 (in thousands):

 
  2010   2009   2008  

Beginning balance

  $ 3,452,512   $ 3,121,576   $ 2,893,583  

Acquisitions of operating properties

    187,052     119,249     36,069  

Improvements and other additions

    338,358     211,752     239,898  

Sales

    (29,430 )   (65 )   (32,071 )

Retirements/disposals

            (15,903 )

Other

    (5 )        
               

Ending balance

  $ 3,948,487   $ 3,452,512   $ 3,121,576  
               

        The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):

 
  2010   2009   2008  

Beginning balance

  $ 422,612   $ 343,110   $ 288,747  

Depreciation expense

    88,048     79,650     74,158  

Sales

    (7,764 )       (3,892 )

Retirements/disposals

        (2 )   (15,903 )

Other

    136     (146 )    
               

Ending balance

  $ 503,032   $ 422,612   $ 343,110  
               

F-66