SBA COMMUNICATIONS CORP - Annual Report: 2012 (Form 10-K)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

For the fiscal year ended December 31, 2012

OR

For the transition period from                      to                     

Commission file number: 000-30110

SBA COMMUNICATIONS CORPORATION

(Exact name of Registrant as specified in its charter)

Registrant’s telephone number, including area code (561) 995-7670

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

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.    Yes  x    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.    Yes  ¨    No  x

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.    Yes  x    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).    Yes  x    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.  ¨

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.

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

The aggregate market value of the voting stock held by non-affiliates of the Registrant was approximately $6.2 billion as of June 30, 2012.

The number of shares outstanding of the Registrant’s common stock (as of February 15, 2013): Class A common stock — 126,954,515 shares

Documents Incorporated By Reference

Portions of the Registrant’s definitive proxy statement for its 2013 annual meeting of shareholders, which proxy statement will be filed no later than 120 days after the close of the Registrant’s fiscal year ended December 31, 2012, are hereby incorporated by reference in Part III of this Annual Report on Form 10-K.

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ITEM 1. BUSINESS

General

We are a leading independent owner and operator of wireless communications towers. Our principal operations are in the United States and its territories. In addition, we own and operate towers in Canada, Central America and South America. Our primary business line is our site leasing business, which contributed 97.4% of our total segment operating profit for the year ended December 31, 2012. In our site leasing business, we lease antenna space primarily to wireless service providers on towers and other structures that we own, manage or lease from others. The towers that we own have been constructed by us at the request of a wireless service provider, built or constructed based on our own initiative or acquired. As of December 31, 2012, we owned 17,491 tower sites, the majority of which have been built by us or built by other tower owners or operators who, like us, have built such towers to lease space to multiple wireless service providers. We also managed or leased approximately 4,800 actual or potential communications sites, approximately 500 of which were revenue producing as of December 31, 2012. Our other business line is our site development business, through which we assist wireless service providers in developing and maintaining their own wireless service networks.

Site Leasing Services

Our primary focus is the leasing of antenna space on our multi-tenant towers to a variety of wireless service providers under long-term lease contracts in the United States, Canada, Central America and South America. Site leasing revenues are received primarily from wireless service provider tenants, including AT&T, Sprint, Verizon Wireless, T-Mobile, Digicel, Claro, and Telefonica. Wireless service providers enter into numerous different tenant leases with us, each of which relates to the lease or use of space at an individual tower site. In the United States and Canada our tenant leases are generally for an initial term of five to ten years with five 5-year renewal periods at the option of the tenant. These tenant leases typically contain specific rent escalators, which average 3-4% per year, including the renewal option periods. Tenant leases in our Central and South America markets typically have an initial term of 10 years with 5-year renewal periods. In Central America, we have similar rent escalators to that of leases in the United States and Canada while our leases in South America typically escalate in accordance with a standard cost of living index.

We expand our tower portfolio, both domestically and internationally, through the construction of new towers, or new builds, and through the acquisition of towers from third parties. In our new build program, we construct towers in locations that were strategically chosen by us or under build-to-suit arrangements. Under build-to-suit arrangements, we build towers for wireless service providers at locations that they have identified. We retain ownership of the tower and the exclusive right to co-locate additional tenants on the tower. When we construct towers in locations chosen by us, we utilize our knowledge of our customers’ network requirements to identify locations where we believe multiple wireless service providers need, or will need, to locate antennas to meet capacity or service demands. We seek to identify attractive locations for new towers and complete pre-construction procedures necessary to secure the site concurrently with our leasing efforts. We generally will have at least one signed tenant lease for each new build tower on the day that it is completed and expect that some will have multiple tenants. During 2013, we intend to build between 380 and 400 new towers, domestically and internationally.

In our tower acquisition program, we pursue towers that meet or exceed our internal guidelines regarding current and future potential returns. For each acquisition, we prepare various analyses that include projections of a five-year unlevered internal rate of return, review of available capacity, future lease up projections and a summary of current and future tenant/technology mix.

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The table below provides information regarding the development and status of our tower portfolio over the past three years.

As of December 31, 2012, we had an average of 2.0 tenants per tower.

Our site leasing business generates substantially all of our total segment operating profit. Our site leasing business generated 88.7% of our total revenues during the year ended December 31, 2012 and has represented 97.4% or more of our total segment operating profit for the past three years. For the year ended December 31, 2012, site leasing revenues generated outside the U.S. and its territories was less than 6% of total revenue.

International Operations

In 2012, we continued to focus on growing our international operations, including the acquisition of 800 towers in Brazil. We believe that we can create substantial value by expanding our site leasing services into select international markets which we believe have a high-growth wireless industry and relatively stable political and regulatory environments. At December 31, 2012, we owned 2,562 towers in Brazil, Canada, Costa Rica, El Salvador, Guatemala, Nicaragua and Panama, and intend to continue expanding in these and other international markets. The majority of these international markets typically have less mature wireless networks with limited wireline infrastructure and wireless data penetration. Accordingly, our expansion in these markets is primarily driven by (i) wireless service providers seeking to increase the quality and coverage of their networks, (ii) consumers’ increased use of high data applications, such as email, internet access and video, and (iii) incremental spectrum auctions, which have resulted in new market entrants, as well as incremental voice and data network deployments. For example, we have had a meaningful build-out of our new towers and communication sites in Costa Rica as a result of spectrum auctions in that country. We expect to continue expanding internationally through buying or building towers, managing communication sites and leasing space to wireless service providers on assets we control.

We consider various factors when identifying a market for our international expansion, including:

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Site Development Services

Our site development business, which is conducted in the United States only, is complementary to our site leasing business and provides us the ability to keep in close contact with the wireless service providers who generate substantially all of our site leasing revenue and to capture ancillary revenues that are generated by our site leasing activities, such as antenna and equipment installation at our tower locations. Site development services revenues are received primarily from providing a full range of end to end services to wireless service providers or companies providing development or project management services to wireless service providers. Our services include: (1) network pre-design; (2) site audits; (3) identification of potential locations for towers and antennas; (4) support in buying or leasing of the location; (5) assistance in obtaining zoning approvals and permits; (6) tower and related site construction; (7) antenna installation; and (8) radio equipment installation, commissioning and maintenance.

We provide our site development services on a local basis, through regional offices, territory offices and project offices. The regional offices are responsible for all site development operations, including hiring employees and opening or closing project offices, and a substantial portion of the sales in such area.

For financial information about our operating segments, please see Note 21 of our Consolidated Financial Statements included in this Form 10-K.

Industry Developments

We believe that growing wireless traffic (particularly data and video), the deployment of additional spectrum, and technology advancements will require wireless service providers to improve their network infrastructure and increase their network capacity resulting in an increase in the number of communication sites that they use or the number of antennas at existing communication sites. The following is a discussion of certain growth trends in the wireless communications industry:

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Despite the recent economic challenges affecting the global marketplace, based on these factors, we believe that the world-wide wireless industry will continue to grow and is well-capitalized, highly competitive and focused on quality and advanced services. Therefore, we expect that we will see a multi-year trend of strong additional cell site demand from our customers, which we believe will translate into strong leasing growth for us.

Business Strategy

Our primary strategy is to continue to focus on expanding our site leasing business due to its attractive characteristics such as long-term contracts, built-in rent escalators, high operating margins and low customer churn. The long-term nature of the revenue stream of our site leasing business makes it less volatile than our site development business, which is more cyclical. By focusing on our site leasing business, we believe that we can maintain a stable, recurring cash flow stream and reduce our exposure to cyclical changes in customer spending. Key elements of our strategy include:

Maximizing Use of Tower Capacity. We generally have constructed or acquired towers that accommodate multiple tenants and a majority of our towers are high capacity towers. Most of our towers have significant capacity available for additional antennas and we believe that increased use of our towers can be achieved at a low incremental cost. We actively market space on our towers through our internal sales force.

Disciplined Growth of our Tower Portfolio. We believe that our tower operations are highly scalable. Consequently, we believe that we are able to materially increase our tower portfolio without proportionately increasing selling, general and administrative expenses. During 2013, we intend to continue to grow our tower portfolio, domestically and internationally, by 5% to 10%; through tower acquisitions and the construction of new towers. In connection with our international expansion, we have targeted select international markets that we believe have relatively stable political environments and a growing wireless communication industry. We intend to use our available cash from operating activities and available liquidity, including borrowings, to build and/or acquire new towers at prices that we believe will be accretive to our shareholders both in the short and long term and which allow us to maintain our long-term target leverage ratios.

Capitalizing on our Scale and Management Experience. We are a large owner, operator and developer of tower and other communication sites, with substantial capital, human and operating resources. We have been developing communication sites for wireless service providers in the U.S. since 1989 and owned and operated tower sites for ourselves since 1997. We believe our size, experience, capabilities and resources make us a preferred partner for wireless service providers both in the U.S. and internationally. Our management team has extensive experience in site leasing and site development, with some of the longest tenures in the tower and site development industries. Management believes that its industry expertise and strong relationships with wireless service providers will allow us to expand our position as a leading provider of site leasing and site development services.

Controlling our Underlying Land Positions. We have purchased and intend to continue to purchase and/or enter into perpetual easements or long-term leases for the land that underlies our towers, to the extent available at commercially

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reasonable prices. We believe that these purchases, perpetual easements, and/or long-term leases will increase our margins, improve our cash flow from operations and minimize our exposure to increases in ground lease rents in the future. For the quarter ended December 31, 2012, approximately 70% of our tower sites were located on land that we own or control for more than 20 years and the average remaining life under our ground leases, including renewal options under our control, was 31 years. As of December 31, 2012, approximately 6.1% of our tower sites have ground leases maturing in the next 10 years.

Using our Local Presence to Build Strong Relationships with Major Wireless Service Providers. Given the nature of towers as location specific communications facilities, we believe that substantially all of what we do is done best locally. Consequently, we have a broad field organization that allows us to develop and capitalize on our experience, expertise and relationships in each of our local markets which in turn enhances our customer relationships. We are seeking to replicate this operating model internationally. Due to our presence in local markets, we believe we are well positioned to capture additional site leasing business and new tower build opportunities in our markets and identify and participate in site development projects across our markets.

Customers

Since commencing operations, we have performed site leasing and site development services for all of the large U.S. wireless service providers. In both our site leasing and site development businesses, we work with large national providers and smaller regional, local or private operators.

We depend on a relatively small number of customers for our site leasing and site development revenues. The following customers represented at least 10% of our total revenues during the last three years:

During the past two years, we provided services for a number of customers, including:

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Sales and Marketing

Our sales and marketing goals are to:

We approach sales on a company-wide basis, involving many of our employees. We have a dedicated sales force that is supplemented by members of our executive management team. Our dedicated salespeople are based regionally as well as in the corporate office. We also rely on our vice presidents, general managers and other operations personnel to sell our services and cultivate customers. Our strategy is to delegate sales efforts to those employees of ours who have the best relationships with our customers. Most wireless service providers have national corporate headquarters with regional and local offices. We believe that wireless service providers make most decisions for site development and site leasing services at the regional and local levels with input from their corporate headquarters. Our sales representatives work with wireless service provider representatives at the regional and local levels and at the national level when appropriate. Our sales staff compensation is heavily weighted to incentive-based goals and measurements.

Competition

Site Leasing – Our primary competitors for our site leasing activities are (1) the national independent tower companies including American Tower Corporation, Crown Castle International and Global Tower Partners, (2) a large number of regional independent tower owners, (3) wireless service providers that own and operate their own towers and lease, or may in the future decide to lease, antenna space to other providers, and (4) alternative facilities such as rooftops, outdoor and indoor distributed antenna system (“DAS”) networks, billboards and electric transmission towers. As a result of several large mergers and acquisitions, American Tower and Crown Castle have more towers and greater financial resources than we do. Wireless service providers that own and operate their own tower networks are also generally larger and have greater financial resources than we do. We believe that tower location and capacity, quality of service to our tenants, and, to a lesser extent, price have been and will continue to be the most significant competitive factors affecting the site leasing business. Internationally, to date, the competition we have encountered has been from both independent tower companies and wireless service providers that own and operate their own tower networks. In our Central American and Canadian markets, the majority of existing towers are owned by wireless service providers. In Brazil, our competition includes wireless service providers, as well as, independent tower companies.

Site Development – The site development business is extremely competitive and price sensitive. We believe that the majority of our competitors in the U.S. site development business operate within local market areas exclusively, while some firms offer their services nationally. The market includes participants from a variety of market segments offering individual, or combinations of, competing services. The field of competitors includes site development consultants, zoning consultants, real estate firms, right-of-way consulting firms, construction companies, tower owners/managers, radio frequency engineering consultants, telecommunications equipment vendors, which provide end-to-end site development services through multiple subcontractors, and wireless service providers’ internal staff. We believe that providers base their decisions for site development services on a number of criteria, including: company experience, price, track record, local reputation, geographic reach and time for completion of a project.

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Employees

Our executive, corporate development, accounting, finance, human resources, legal and regulatory, information technology and site administration personnel, and our network operations center, are located in our headquarters in Boca Raton, Florida. Certain sales, new tower build support and tower maintenance personnel are also located in our Boca Raton office. Our remaining employees are based in our international, regional, and local offices.

As of December 31, 2012, we had 1,022 employees, none of whom are represented by a collective bargaining agreement. Of these 1,022 employees, 103 were based outside of the U.S. and its territories. We consider our employee relations to be good.

Regulatory and Environmental Matters

Federal Regulations. In the U.S., which accounted for 94.3% of our total site leasing revenue for the year ended December 31, 2012, both the FCC and the Federal Aviation Administration (the “FAA”) regulate antenna towers and structures that support wireless communications and radio or television antennas. Many FAA requirements are implemented in FCC regulations. These regulations govern the construction, lighting and painting or other marking of towers and structures, as well as the maintenance, inspection, and record keeping related to towers and structures, and may, depending on the characteristics of particular towers or structures, require prior approval and registration of towers or structures before they may be constructed, altered or used. Wireless communications equipment and radio or television stations operating on towers or structures are separately regulated and may require independent customer licensing depending upon the particular frequency or frequency band used. In addition, any applicant for an FCC antenna tower or structure registration must certify that, consistent with the Anti-Drug Abuse Act of 1988, neither the applicant nor its principals are subject to a denial of Federal benefits because of a conviction for the possession or distribution of a controlled substance.

Pursuant to the requirements of the Communications Act of 1934, as amended, the FCC, in conjunction with the FAA, has developed standards to consider proposals involving new or modified antenna towers or structures. These standards mandate that the FCC and the FAA consider the height of the proposed tower or structure, the relationship of the tower or structure to existing natural or man-made obstructions and the proximity of the tower or structure to runways and airports. Proposals to construct or to modify existing towers or structures above certain heights must be reviewed by the FAA to ensure the structure will not present a hazard to air navigation. The FAA may condition its issuance of a no-hazard determination upon compliance with specified lighting and/or painting requirements. Antenna towers that meet certain height and location criteria must also be registered with the FCC. A tower or structure that requires FAA clearance will not be registered by the FCC until it is cleared by the FAA. Upon registration, the FCC may also require special lighting and/or painting. Owners of wireless communications antenna towers and structures may have an obligation to maintain painting and lighting or other marking in conformance with FAA and FCC regulations. Antenna tower and structure owners and licensees that operate on those towers or structures also bear the responsibility of monitoring any lighting systems and notifying the FAA of any lighting outage or malfunction.

Owners and operators of antenna towers and structures may be subject to, and therefore must comply with, environmental laws. Any licensed radio facility on an antenna tower or structure is subject to environmental review pursuant to the National Environmental Policy Act of 1969, among other statutes, which requires federal agencies to evaluate the environmental impact of their decisions under certain circumstances. The FCC has issued regulations implementing the National Environmental Policy Act. These regulations place responsibility on applicants to investigate potential environmental effects of their operations and to disclose any potential

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significant effects on the environment in an environmental assessment prior to constructing or modifying an antenna tower or structure and prior to commencing certain operations of wireless communications or radio or television stations from the tower or structure. In the event the FCC determines the proposed structure or operation would have a significant environmental impact based on the standards the FCC has developed, the FCC would be required to prepare an environmental impact statement, which will be subject to public comment. This process could significantly delay the registration of a particular tower or structure.

We generally indemnify our customers against any failure to comply with applicable regulatory standards relating to the construction, modification, or placement of antenna towers or structures. Failure to comply with the applicable requirements may lead to civil penalties.

The Telecommunications Act of 1996 amended the Communications Act of 1934 by preserving state and local zoning authorities’ jurisdiction over the construction, modification and placement of towers. The law, however, limits local zoning authority by prohibiting any action that would discriminate among different providers of personal wireless services or ban altogether the construction, modification or placement of radio communication towers. Finally, the Telecommunications Act of 1996 requires the federal government to help licensees for wireless communications services gain access to preferred sites for their facilities. This may require that federal agencies and departments work directly with licensees to make federal property available for tower facilities.

As an owner and operator of real property, we are subject to certain environmental laws that impose strict, joint and several liability for the cleanup of on-site or off-site contamination and related personal or property damage. We are also subject to certain environmental laws that govern tower or structure placement, including pre-construction environmental studies. Operators of towers or structures must also take into consideration certain radio frequency (“RF”) emissions regulations that impose a variety of procedural and operating requirements. Certain proposals to operate wireless communications and radio or television stations from antenna towers and structures are also reviewed by the FCC to ensure compliance with requirements relating to human exposure to RF emissions. Exposure to high levels of RF energy can produce negative health effects. The potential connection between low-level RF energy and certain negative health effects, including some forms of cancer, has been the subject of substantial study by the scientific community in recent years. We believe that we are in substantial compliance with and we have no material liability under any applicable environmental laws. These costs of compliance with existing or future environmental laws and liability related thereto may have a material adverse effect on our prospects, financial condition or results of operations.

State and Local Regulations. Most states regulate certain aspects of real estate acquisition, leasing activities and construction activities. Where required, we conduct the site acquisition portions of our site development services business through licensed real estate brokers’ agents, who may be our employees or hired as independent contractors, and conduct the construction portions of our site development services through licensed contractors, who may be our employees or independent contractors. Local regulations include city and other local ordinances, zoning restrictions and restrictive covenants imposed by community developers. These regulations vary greatly from jurisdiction to jurisdiction, but typically require tower and structure owners to obtain approval from local officials or community standards organizations, or certain other entities prior to tower or structure construction and establish regulations regarding maintenance and removal of towers or structures. In addition, many local zoning authorities require tower and structure owners to post bonds or cash collateral to secure their removal obligations. Local zoning authorities generally have been unreceptive to construction of new antenna towers and structures in their communities because of the height and visibility of the towers or structures, and have, in some instances, instituted moratoria.

International. Regulatory regimes outside of the U.S. and its territories vary by country and locality, however these regulations typically require tower owners and/or licensees to obtain approval from local officials or government agencies prior to tower construction or modification or the addition of a new antenna to an existing

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tower. Additionally, some regulations include ongoing obligations regarding painting, lighting, and maintenance. Our international operations may also be subject to limitations on foreign ownership of land in certain areas. Based on our experience to date, these regimes have been similar to, but not more rigorous, burdensome or comprehensive than, those in the U.S. Non-compliance with such regulations may lead to monetary penalties or deconstruction orders. Our international operations are also subject to various regulations and guidelines regarding employee relations and other occupational health and safety matters. As we expand our operations into additional international geographic areas, we will be subject to regulations in these jurisdictions.

Backlog

Backlog related to our site leasing business consists of lease agreements and amendments, which have been signed, but have not yet commenced. As of December 31, 2012, excluding the Sprint Network Vision Amendment, we had 1,052 new leases and amendments which had been executed with customers but which had not begun generating revenue. These leases and amendments will contractually provide for approximately $8.1 million of annual revenue. By comparison, as of December 31, 2011, we had 251 new leases and amendments which had been executed with customers but which had not begun generating revenue. These leases and amendments contractually provided for approximately $5.1 million of annual revenue.

Our backlog for site development services consists of the value of work that has not yet been completed on executed contracts. As of December 31, 2012, we had approximately $45.9 million of contractually committed revenue as compared to approximately $14.5 million as of December 31, 2011.

Availability of Reports and Other Information

SBA Communications Corporation was incorporated in the State of Florida in March 1997. Our corporate website is www.sbasite.com. We make available, free of charge, access to our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, Proxy Statement on Schedule 14A and amendments to those materials filed or furnished pursuant to Section 13(a) or 15(d) of the Securities and Exchange Act of 1934, as amended, on our website under “Investor Relations – Reports and Results – SEC Filings,” as soon as reasonably practicable after we file electronically such material with, or furnish it to, the United States Securities and Exchange Commission (the “Commission”).

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ITEM 1A. RISK FACTORS

Risks Related to Our Business

If our wireless service provider customers combine their operations to a significant degree, our future operating results and our ability to service our indebtedness could be adversely affected.

Significant consolidation among our wireless service provider customers may result in our customers failing to renew existing leases for tower space or reducing future capital expenditures in the aggregate because their existing networks and expansion plans may overlap or be very similar. In connection with the combinations of Verizon Wireless and ALLTEL (to form Verizon Wireless), Cingular and AT&T Wireless (to form AT&T Mobility) and Sprint PCS and Nextel (to form Sprint Nextel), the combined companies have rationalized and may continue to rationalize duplicative parts of their networks, which has led and may continue to lead to the non-renewal of certain leases on our towers. If our wireless service provider customers continue to consolidate as a result of, among other factors, limited wireless spectrum for commercial use in the U.S., this consolidation could significantly impact the number of tower leases that are not renewed or the number of new leases that our wireless service provider customers require to expand their networks, which could materially and adversely affect our future operating results.

We have a substantial level of indebtedness which may have an adverse effect on our business or limit our ability to take advantage of business, strategic or financing opportunities.

As indicated below, we have and will continue to have a significant amount of indebtedness relative to our equity. The following table sets forth our total principal amount of debt and shareholders’ equity as of December 31, 2011 and 2012.

Our substantial level of indebtedness increases the possibility that we may be unable to generate cash sufficient to pay the principal, interest or other amounts due on our indebtedness. Subject to certain restrictions under our existing indebtedness, we and our subsidiaries may also incur significant additional indebtedness in the future, some of which may be secured debt. This may have the effect of increasing our total leverage.

As a consequence of our indebtedness, (1) demands on our cash resources may increase, (2) we are subject to restrictive covenants that further limit our financial and operating flexibility and (3) we may choose to institute self-imposed limits on our indebtedness based on certain considerations including market interest rates, our relative leverage and our strategic plans. For example, as a result of our substantial level of indebtedness and the uncertainties arising in the credit markets and the U.S. economy:

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These restrictions could have a material adverse effect on our business by limiting our ability to take advantage of financing, new tower development, mergers and acquisitions or other opportunities.

In addition, fluctuations in market interest rates may increase interest expense relating to our floating rate indebtedness, which we expect to incur under our Revolving Credit Facility and Term Loans, and may make it difficult to refinance our existing indebtedness at a commercially reasonable rate or at all. There is no guarantee that the future refinancing of our indebtedness will have fixed interest rates or that interest rates on such indebtedness will be equal to or lower than the rates on our current indebtedness.

We depend on a relatively small number of customers for most of our revenue, and the loss, consolidation or financial instability of any of our significant customers may materially decrease our revenues.

We derive a significant portion of our revenue from a small number of customers. Consequently, a reduction in demand for site leasing, reduced future capital expenditures on the networks, or the loss, as a result of bankruptcy, merger with other customers of ours or otherwise, of any of our largest customers could materially decrease our revenue and have an adverse effect on our growth. Our substantial acquisitions in 2012 further increased our client concentration and exacerbated the risks associated with such concentration.

The following is a list of significant customers (representing at least 10% of revenue in any of the last three years) and the percentage of our total revenues for the specified time periods derived from these customers:

We also have client concentrations with respect to revenues in each of our financial reporting segments:

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Revenue from these clients is derived from numerous different site leasing contracts and site development contracts. Each site leasing contract relates to the lease of space at an individual tower site and is generally for an initial term of five to ten years in the U.S. and Canada, and renewable for five 5-year periods at the option of the tenant. Our Central and South America markets typically have an initial term of 10 years with 5-year renewal periods. However, if any of our significant site leasing clients were to experience financial difficulty, substantially reduce their capital expenditures or reduce their dependence on leased tower space and fail to renew their leases with us, our revenues, future revenue growth and results of operations would be adversely affected.

Our site development customers engage us on a project-by-project basis, and a customer can generally terminate an assignment at any time without penalty. In addition, a customer’s need for site development services can decrease, and we may not be successful in establishing relationships with new customers. Furthermore, our existing customers may not continue to engage us for additional projects.

A slowdown in demand for wireless communications services or for tower space could materially and adversely affect our future growth and revenues.

If wireless service subscribers significantly reduce their minutes of use, or fail to widely adopt and use wireless data applications, our wireless service provider customers would experience a decrease in demand for their services. Regardless of consumer demand, each wireless service customer must have substantial capital resources and capabilities to build out their wireless networks, including licenses for spectrum. In addition, our wireless service customers have engaged in increased use of network sharing, roaming or resale arrangements. As a result of all of the above, wireless carriers may scale back their business plans or otherwise reduce their spending, which could materially and adversely affect demand for our tower space and our wireless communications services business, which could have a material adverse effect on our business, results of operations and financial condition.

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Our international operations are subject to economic, political and other risks, including risks associated with foreign currency exchange rates, that could materially and adversely affect our revenues or financial position.

Our current business operations in Canada, Central America and South America, and our expansion into any other international markets in the future, could result in adverse financial consequences and operational problems not typically experienced in the United States. Although the consolidated revenues generated by our international operations were less than 6% during the year ended December 31, 2012, we anticipate that our revenues from our international operations will grow in the future. Accordingly, our business is and will in the future be subject to risks associated with doing business internationally, including:

The majority of our international operations are denominated in United States dollars. However, for some of our international operations, particularly Brazil, we face risks associated with changes in foreign currency exchange rates, including those arising from our operations, investments and financing transactions related to our international business. Volatility in foreign currency exchange rates can also affect our ability to plan, forecast and budget for our international operations and expansion efforts.

If we are unable to protect our rights to the land under our towers, it could adversely affect our business and operating results.

Our real property interests relating to our towers consist primarily of leasehold and sub-leasehold interests, fee interests, easements, licenses, rights-of-way, and other similar interests. From time to time, we experience disputes with landowners regarding the terms of the agreements for the land under our towers, which can affect our ability to access and operate such towers. Further, landowners may not want to renew their agreements with us, they may lose their rights to the land, or they may transfer their land interests to third parties, including ground lease aggregators and our competitors, which could affect our ability to renew agreements on commercially viable terms or at all. Our inability to protect our rights to the land under our towers may have a future material adverse effect on our business, results of operations or financial condition.

In addition, we may not always have the ability to analyze and verify all information regarding title, access and other issues regarding the land underlying acquired towers. To the extent that we do not have complete access to, or use of, the land underlying the acquired towers, it could require us to incur additional expenses before we can operate and generate revenue from such tower.

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Increasing competition may negatively impact our ability to grow our tower portfolio long term.

We currently intend to grow our tower portfolio 5% to 10% annually, domestically and internationally, through acquisitions and new builds. Our ability to meet these growth targets significantly depends on our ability to acquire existing towers that meet our investment requirements. Traditionally, our acquisition strategy has focused on acquiring towers from smaller tower companies, independent tower developers and wireless service providers. However, as a result of consolidation in the tower industry there are fewer of these mid-sized tower transactions available and there is more competition to acquire existing towers. Increased competition for acquisitions may result in fewer acquisition opportunities for us, higher acquisition prices, and increased difficulty in negotiating and consummating agreements to acquire such towers. Furthermore, to the extent that the tower acquisition opportunities are for significant tower portfolios, many of our competitors are significantly larger and have greater financial resources than us. As a result of these risks, the cost of acquiring these towers may be higher than we expect or we may not be able to add as many towers as we had planned in 2013. If we are not able to successfully address these challenges, we may not be able to materially increase our tower portfolio in the long-term.

Our convertible note hedge transactions may not cover all of the potential dilution or additional cash outlay, if we settled the notes in cash, to which we may be subject upon conversion of the notes.

Concurrently with the pricing of our 1.875% Convertible Senior Notes due 2013 (the “1.875% Notes”) and our 4.0% Convertible Senior Notes due 2014 (the “4.0% Notes”) we entered into convertible note hedge transactions and warrant transactions with affiliates of certain of the initial purchasers of the convertible note offerings. The initial strike price of the convertible note hedge transactions relating to our 1.875% Notes is $41.46 per share of our Class A common stock (the same as the initial conversion price of our 1.875% convertible notes) and the upper strike price of the warrants is $67.37 per share. The initial strike price of the convertible note hedge transactions relating to our 4.0% convertible Notes is $30.38 per share of our Class A common stock (the same as the initial conversion price of the 4.0% Notes) and the upper strike price of the warrant transactions is $44.64 per share. Pursuant to the terms of the warrant transaction, we are responsible for the dilution or costs, to the extent that we settle in cash or stock, arising from the conversion of the notes to the extent that the market price of our Class A common stock exceeds the strike price of the warrants. We have purchased an aggregate of $81.2 million in principal amount of the 1.875% Notes, and $468.8 million remains outstanding. If the market price of our Class A common stock significantly exceeded either of these strike prices on their respective conversion dates we would be subject to material dilution or, to the extent we elected to settle in cash, material additional costs.

Initially we entered into convertible note hedge and warrant transactions to cover the full amount of the shares that were issuable upon conversion of the 1.875% Notes and the 4.0% Notes. However, as a result of the bankruptcy of Lehman Brothers OTC Derivatives Inc. (“Lehman Derivatives”), we terminated the convertible note hedge transaction that we had entered into with Lehman Derivatives. The terminated convertible note hedge transaction had originally covered 55% of the 13,265,780 shares of our Class A common stock potentially issuable upon conversion of our 1.875% Notes. Consequently, we do not currently have a hedge with respect to that percentage of the shares issuable upon conversion of the 1.875% Notes To the extent that the market price of our Class A common stock exceeds $41.46 per share upon conversion of the notes, we will be subject to dilution or if we settle in cash, additional costs, upon conversion of that portion of the 1.875% Notes. If any of the other counterparties to our convertible hedge transactions were to default in their obligations, then our potential dilution or costs upon conversion of the respective notes would be materially increased.

At the end of the first quarter of 2012 the 4.0% Notes became convertible by the note holders because our Class A common stock closing price per share exceeded $39.49 for at least 20 trading days during the 30 consecutive trading day period ending on March 31, 2012. The requisite conditions were again met as of the end of the second, third and fourth quarters of 2012 and the 4.0% Notes remained convertible by the note holders. The 4.0% Notes will continue to be convertible through March 31, 2013, and will still be convertible thereafter, if one or more of the conversion conditions are satisfied.

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At the end of the third quarter of 2012, the conversion right for the 1.875% Notes was triggered because our Class A common stock closing price per share exceeded $53.90 for at least 20 trading days during the 30 consecutive trading day period ending on September 30, 2012. The requisite conditions were again met as of the end of the fourth quarter of 2012 and the 1.875% Notes remained convertible by the note holders. The 1.875% Notes will continue to be convertible until March 31, 2013, and may be convertible thereafter, if one or more of the conversion conditions are satisfied.

New technologies and their use by carriers may have a material adverse effect on our growth rate and results of operations.

The emergence of new technologies could reduce the demand for space on our towers. For example, the increased use by wireless service providers of signal combining and related technologies and products that allow two or more wireless service providers to provide services on different transmission frequencies using the same communications antenna and other facilities normally used by only one wireless service provider (i.e. network sharing) could reduce the demand for our tower space. Additionally, the use of technologies that enhance spectral capacity, such as beam forming or “smart antennae,” that can increase the range and capacity of an antenna could reduce the number of additional sites a wireless service provider needs to adequately serve a certain subscriber base and therefore reduce demand for our tower space. The development and growth of communications and other new technologies that do not require ground-based sites, such as the growth in delivery of video, voice and data services by satellites or other technologies, could also adversely affect the demand for our tower space. If any of these or other new technologies are widely adopted in the future it could have a material adverse effect on our growth and results of operations.

Our acquisition initiatives may disrupt our operations or heighten the risks inherent in our growth strategy. In addition, future acquisitions that are material in the aggregate may increase our debt levels and our leverage.

A key element of our growth strategy is to increase our tower portfolio through acquisitions. Consequently, as part of our business, we evaluate potential acquisitions, some of which may be, individually or in the aggregate, materially significant in terms of the number of towers to be acquired or the price that we would need to pay. Any future acquisitions that we may consummate that are material could increase our absolute level of debt and our pro forma leverage ratio.

In addition, acquisitions which would be material in the aggregate may exacerbate the risks inherent with our growth strategy, such as (i) an adverse impact on our overall profitability if the acquired towers do not achieve the financial results projected in our valuation models, (ii) unanticipated costs associated with the acquisitions that may impact our results of operations for a period, (iii) increased demands on our cash resources that may, among other things, impact our ability to explore other opportunities, (iv) undisclosed and assumed liabilities that we may be unable to recover, (v) increased vulnerability to general economic conditions, (vi) an adverse impact on our existing customer relationships, (vii) additional expenses and exposure to new regulatory, political and economic risks if such acquisitions were in new jurisdictions and (viii) diversion of managerial attention.

We may not successfully integrate acquired towers into our operations.

As part of our growth strategy, we have made and expect to continue to make acquisitions. The process of integrating any acquired towers into our operations may result in unforeseen operating difficulties and large expenditures and may absorb significant management attention that would otherwise be available for the ongoing development of our business. It may also result in the loss of key customers and/or personnel and expose us to unanticipated liabilities. These risks may be exacerbated in those circumstances in which we acquire a material number of towers. Further, we may not be able to retain the key employees that may be necessary to operate the business we acquire, and, we may not be able to timely attract new skilled employees and management to replace them. There can be no assurance that we will be successful in integrating acquisitions into our existing business.

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Delays or changes in the deployment or adoption of new technologies or slowing consumer adoption rates may have a material adverse effect on our growth rate.

There can be no assurances that 3G, 4G or other new wireless technologies will be deployed or adopted as rapidly as projected or that these new technologies will be implemented in the manner anticipated. The deployment of 3G experienced delays from the original projected timelines of the wireless and broadcast industries, and deployment of 4G has been limited to date. Additionally, the demand by consumers and the adoption rate of consumers for these new technologies once deployed may be lower or slower than anticipated. These factors could have a material adverse effect on our growth rate since growth opportunities and demand for our tower space as a result of such new technologies may not be realized at the times or to the extent anticipated.

We may not secure as many site leasing tenants as planned or our lease rates for new tenant leases may decline.

If wireless service provider demand for tower space or our lease rates on new leases decrease, we may not be able to successfully grow our site leasing business as expected. This may have a material adverse effect on our strategy, revenue growth and our ability to satisfy our financial and other contractual obligations. Our plan for the growth of our site leasing business largely depends on our management’s expectations and assumptions concerning future tenant demand and potential lease rates for our towers.

Increasing competition in the tower industry may create pricing pressures that may materially and adversely affect us.

Our industry is highly competitive, and our customers sometimes have alternatives for leasing antenna space. Some of our competitors, such as (1) U.S. and international wireless carriers that allow collocation on their towers and (2) large independent tower companies, are substantially larger and have greater financial resources than us. This could provide them with advantages with respect to establishing favorable leasing terms with wireless service providers or in their ability to acquire available towers.

In the site leasing business, we compete with:

We believe that tower location and capacity, quality of service, density within a geographic market and, to a lesser extent, price historically have been and will continue to be the most significant competitive factors affecting the site leasing business. However, competitive pricing pressures for tenants on towers from these competitors could materially and adversely affect our lease rates. In addition, we may not be able to renew existing customer leases or enter into new customer leases, resulting in a material adverse impact on our results of operations and growth rate. Increasing competition could also make the acquisition of high quality tower assets more costly, or limit the acquisition opportunities altogether. Any of these factors could materially and adversely affect our business, results of operations or financial condition.

The site development segment of our industry is also extremely competitive. There are numerous large and small companies that offer one or more of the services offered by our site development business. As a result of

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this competition, margins in this segment continue to be under pressure. Many of our competitors have lower overhead expenses and therefore may be able to provide services at prices that we consider unprofitable. If margins in this segment were to further decrease, our consolidated revenues and our site development segment operating profit could be adversely affected.

The documents governing our indebtedness contain restrictive covenants that could adversely affect our business by limiting our flexibility.

The indentures governing the 8.25% Notes, the 5.75% Notes and the 5.625% Notes, the Senior Credit Agreement and the Secured Tower Revenue Securities contain restrictive covenants imposing significant operational and financial restrictions on us, including restrictions that may limit our ability to engage in acts that may be in our long-term best interests. Among other things, the covenants under each indenture limit our ability to:

We are required to maintain certain financial ratios under the Senior Credit Agreement. The Senior Credit Agreement requires SBA Senior Finance II and SBACC to maintain specific financial ratios, including, at the SBA Senior Finance II level, (1) a ratio of Consolidated Total Debt to Annualized Borrower EBITDA not to exceed 6.0 times for any fiscal quarter, (2) a ratio of Consolidated Total Debt and Net Hedge Exposure (calculated in accordance with the Senior Credit Agreement) to Annualized Borrower EBITDA for the most recently ended fiscal quarter not to exceed 6.0 times for 30 consecutive days and (3) a ratio of Annualized Borrower EBITDA to Annualized Cash Interest Expense (calculated in accordance with the Senior Credit Agreement) of not less than 2.0 times for any fiscal quarter. In addition, SBACC’s ratio of Consolidated Total Net Debt to Consolidated Adjusted EBITDA (calculated in accordance with the Senior Credit Agreement) for any fiscal quarter on an annualized basis cannot exceed 9.5 times.

Additionally, the mortgage loan relating to our Tower Securities contains financial covenants that require that the mortgage loan borrowers maintain, on a consolidated basis, a minimum debt service coverage ratio. To the extent that the debt service coverage ratio, as of the end of any calendar quarter, falls to 1.30 times or lower, then all cash flow in excess of amounts required to make debt service payments, to fund required reserves, to pay management fees and budgeted operating expenses and to make other payments required under the loan documents, referred to as “excess cash flow,” will be deposited into a reserve account instead of being released to the Borrowers. The funds in the reserve account will not be released to the Borrowers unless the debt service coverage ratio exceeds 1.30 times for two consecutive calendar quarters. If the debt service coverage ratio falls below 1.15 times as of the end of any calendar quarter, then an “amortization period” will commence and all funds on deposit in the reserve account will be applied to prepay the mortgage loan until such time that the debt service coverage ratio exceeds 1.15 times for a calendar quarter.

These covenants could place us at a disadvantage compared to some of our competitors which may have fewer restrictive covenants and may not be required to operate under these restrictions. Further, these covenants could have an adverse effect on our business by limiting our ability to take advantage of financing, new tower development, merger and acquisitions or other opportunities. If we fail to comply with these covenants, it could result in an event of default under our debt instruments. If any default occurs, all amounts outstanding under our outstanding notes and the Senior Credit Agreement may become immediately due and payable.

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Our variable rate indebtedness and refinancing obligations subject us to interest rate risk, which could cause our debt service obligations to increase significantly.

Fluctuations in market interest rates may increase interest expense relating to our floating rate indebtedness, which we expect to incur under the Revolving Credit Facility and Term Loans or upon refinancing our fixed rate debt. As a result, we are exposed to interest rate risk. If interest rates were to increase, our debt service obligations on the variable rate indebtedness would increase even though the amount borrowed remained the same, and our net income and cash flows, including cash available for servicing our indebtedness, will correspondingly decrease. There is no guarantee that any future refinancing of our indebtedness will have fixed interest rates or that interest rates on such indebtedness will be equal to or lower than the rates on our current indebtedness. In the future, we may enter into interest rate swaps that involve the exchange of floating for fixed rate interest payments in order to reduce interest rate volatility. However, we may not maintain interest rate swaps with respect to all of our variable rate indebtedness, and any swaps we enter into may not fully mitigate our interest rate risk.

Our dependence on our subsidiaries for cash flow may negatively affect our business.

We are a holding company with no business operations of our own. Our only significant assets are, and are expected to be, the outstanding capital stock and membership interests of our subsidiaries. We conduct, and expect to continue conducting, all of our business operations through our subsidiaries. Accordingly, our ability to pay our obligations is dependent upon dividends and other distributions from our subsidiaries to us. Most of our indebtedness is owed directly by our subsidiaries, including the mortgage loan underlying the Tower Securities, the 8.25% Notes, the 5.75% Notes, the Term Loans and any amounts that we may borrow under the Revolving Credit Facility. Consequently, the first use of any cash flow from operations generated by such subsidiaries will be payments of interest and principal, if any, under their respective indebtedness. Other than the cash required to repay amounts due under our outstanding convertible notes, we currently expect that substantially all the earnings and cash flow of our subsidiaries will be retained and used by them in their operations, including servicing their respective debt obligations. The ability of our operating subsidiaries to pay dividends or transfer assets to us is restricted by applicable state law and contractual restrictions, including the terms of their outstanding debt instruments.

Our quarterly operating results for our site development services fluctuate and therefore we may not be able to adjust our cost structure on a timely basis with regard to such fluctuations.

The demand for our site development services fluctuates from quarter to quarter and should not be considered indicative of long-term results. Numerous factors cause these fluctuations, including:

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Although the demand for our site development services fluctuates, we incur significant fixed costs, such as maintaining a staff and office space, in anticipation of future contracts. In addition, the timing of revenues is difficult to forecast because our sales cycle may be relatively long. Therefore, we may not be able to adjust our cost structure on a timely basis to respond to the fluctuations in demand for our site development services.

We are not profitable and expect to continue to incur losses.

We are not profitable. The following chart shows the net losses we incurred for the periods indicated:

Our losses are principally due to depreciation, amortization and accretion expenses, interest expense (including non-cash interest expense and amortization of deferred financing fees), and losses from the extinguishment of debt in the periods presented above. We expect to continue to incur significant losses, which may affect our ability to service our indebtedness.

The loss of the services of certain of our key personnel or a significant number of our employees may negatively affect our business.

Our success depends to a significant extent upon performance and active participation of our key personnel. We cannot guarantee that we will be successful in retaining the services of these key personnel. We have employment agreements with Jeffrey A. Stoops, our President and Chief Executive Officer, Kurt L. Bagwell, our Senior Vice President and President—International, Thomas P. Hunt, our Senior Vice President, Chief Administrative Officer and General Counsel, and Brendan T. Cavanagh, our Senior Vice President and Chief Financial Officer. We do not have employment agreements with any of our other key personnel. If we were to lose any key personnel, we may not be able to find an appropriate replacement on a timely basis and our results of operations could be negatively affected. Further, the loss of a significant number of employees or our inability to hire a sufficient number of qualified employees could have a material adverse effect on our business.

Our business is subject to government regulations and changes in current or future regulations could harm our business.

We are subject to federal, state and local regulation of our business, both in the U.S. and internationally. In the U.S., both the Federal Aviation Administration (“FAA”) and the FCC regulate the construction, modification and maintenance of antenna towers and structures that support wireless communications and radio and television antennas. In addition, the FCC separately licenses and regulates wireless communications equipment and television and radio stations operating from such towers and structures. FAA and FCC regulations govern construction, lighting, painting and marking of towers and structures and may, depending on the characteristics of the tower or structure, require registration of the tower or structure. Certain proposals to construct new towers or structures or to modify existing towers or structures are reviewed by the FAA to ensure that the tower or structure will not present a hazard to air navigation.

Antenna tower owners and antenna structure owners may have an obligation to mark or paint towers or structures or install lighting to conform to FAA and FCC regulations and to maintain such marking, painting and lighting. Antenna tower owners and antenna structure owners may also bear the responsibility of notifying the FAA of any lighting outages. Certain proposals to operate wireless communications and radio or television stations from antenna towers and structures are also reviewed by the FCC to ensure compliance with

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environmental impact requirements. Failure to comply with existing or future applicable requirements may lead to civil penalties or other liabilities and may subject us to significant indemnification liability to our customers against any such failure to comply. In addition, new regulations may impose additional costly burdens on us, which may affect our revenues and cause delays in our growth.

Local regulations, including municipal or local ordinances, zoning restrictions and restrictive covenants imposed by community developers, vary greatly, but typically require antenna tower and structure owners to obtain approval from local officials or community standards organizations prior to tower or structure construction or modification. Local regulations can delay, prevent, or increase the cost of new construction, co-locations, or site upgrades, thereby limiting our ability to respond to customer demand. In addition, new regulations may be adopted that increase delays or result in additional costs to us. Furthermore, with respect to our international new builds, our tower construction may be delayed or halted as a result of local zoning restrictions, inconsistencies between laws or other barriers to construction in international markets. These factors could have a material adverse effect on our future growth and operations.

Our towers are subject to damage from natural disasters.

Our towers are subject to risks associated with natural disasters such as tornadoes, hurricanes and earthquakes. We maintain insurance to cover the estimated cost of replacing damaged towers, but these insurance policies are subject to loss limits and deductibles. We also maintain third party liability insurance, subject to loss limits and deductibles, to protect us in the event of an accident involving a tower. A tower accident for which we are uninsured or underinsured, or damage to a significant number of our towers, could require us to incur significant expenditures and may have a material adverse effect on our operations or financial condition.

To the extent that we are not able to meet our contractual obligations to our customers, due to a natural disaster or other catastrophic circumstances, our customers may not be obligated or willing to pay their lease expenses; however, we would be required to continue paying our fixed expenses related to the affected tower, including ground lease expenses. If we are unable to meet our contractual obligations to our customers for a material portion of our towers, our operations could be materially and adversely affected.

We could have liability under environmental laws that could have a material adverse effect on our business, financial condition and results of operations.

Our operations, like those of other companies engaged in similar businesses, are subject to the requirements of various federal, state, local and foreign environmental and occupational safety and health laws and regulations, including those relating to the management, use, storage, disposal, emission and remediation of, and exposure to, hazardous and non-hazardous substances, materials, and wastes. As owner, lessee or operator of numerous tower sites, we may be liable for substantial costs of remediating soil and groundwater contaminated by hazardous materials, without regard to whether we, as the owner, lessee or operator, knew of or were responsible for the contamination. We may be subject to potentially significant fines or penalties if we fail to comply with any of these requirements. The current cost of complying with these laws is not material to our financial condition or results of operations. However, the requirements of these laws and regulations are complex, change frequently, and could become more stringent in the future. It is possible that these requirements will change or that liabilities will arise in the future in a manner that could have a material adverse effect on our business, financial condition and results of operations.

We could suffer adverse tax and other financial consequences if taxing authorities do not agree with our tax positions, or we are unable to utilize our net operating losses.

We are periodically subject to a number of tax examinations by taxing authorities in the states and countries where we do business. We also have significant deferred tax assets related to our net operating losses (“NOLs”)

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in U.S. federal and state taxing jurisdictions. Generally, for U.S. federal and state tax purposes, NOLs can be carried forward and used for up to twenty years, and all of our tax years will remain subject to examination until three years after our NOLs are used or expire. We expect that we will continue to be subject to tax examinations in the future. In addition, U.S. federal, state and local, as well as international, tax laws and regulations are extremely complex and subject to varying interpretations. We recognize tax benefits of uncertain tax positions when we believe the positions are more likely than not of being sustained upon a challenge by the relevant tax authority. We believe our judgments in this area are reasonable and correct, but there is no guarantee that we will be successful if challenged by a tax authority. If there are tax benefits, including from our use of NOLs or other tax attributes, that are challenged successfully by a taxing authority, we may be required to pay additional taxes or we may seek to enter into settlements with the taxing authorities, which could require significant payments or otherwise have a material adverse effect on our business, results of operations and financial condition.

In addition, we may be limited in our ability to utilize our NOLs to offset future taxable income and thereby reduce our otherwise payable income taxes. We have substantial federal and state NOLs, including significant portions obtained through acquisitions and dispositions, as well as those generated through our historic business operations. In addition, we have disposed of some entities and restructured other entities in conjunction with financing transactions and other business activities.

To the extent we believe that a position with respect to an NOL is not more likely than not to be sustained, we do not record the related deferred tax asset. In addition, for NOLs that meet the recognition threshold, we assess the recoverability of the NOL and establish a valuation allowance against the deferred tax asset related to the NOL if recoverability is questionable. Given the uncertainty surrounding the recoverability of certain of our NOLs, we have established a valuation allowance to offset the related deferred tax asset so as to reflect what we believe to be the recoverable portion of our NOLs.

Our ability to utilize our NOLs is also dependent, in part, upon us having sufficient future earnings to utilize our NOLs before they expire. If market conditions change materially and we determine that we will be unable to generate sufficient taxable income in the future to utilize our NOLs, we could be required to record an additional valuation allowance. We review our uncertain tax position and the valuation allowance for our NOLs periodically and make adjustments from time to time, which can result in an increase or decrease to the net deferred tax asset related to our NOLs. Our NOLs are also subject to review and potential disallowance upon audit by the taxing authorities of the jurisdictions where the NOLs were incurred, and future changes in tax laws or interpretations of such tax laws could limit materially our ability to utilize our NOLs. If we are unable to use our NOLs or use of our NOLs is limited, we may have to make significant payments or otherwise record charges or reduce our deferred tax assets, which could have a material adverse effect on our business, results of operations and financial condition.

Our issuance of equity securities and other associated transactions may trigger a future ownership change which may negatively impact our ability to utilize net operating loss deferred tax assets in the future.

The issuance of equity securities and other associated transactions may increase the chance that we will have a future ownership change under Section 382 of the Internal Revenue Code of 1986. We may also have a future ownership change, outside of our control, caused by future equity transactions by our current shareholders. Depending on our market value at the time of such future ownership change, an ownership change under Section 382 could negatively impact our ability to utilize our net operating loss deferred tax assets in the event we generate future taxable income. Currently, we have recorded a full valuation allowance against our net operating loss deferred tax asset because we have concluded that our loss history indicates that it is not “more likely than not” that such deferred tax assets will be realized.

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Future sales of our Class A common stock in the public market or the issuance of other equity may cause dilution or adversely affect the market price of our Class A common stock and our ability to raise funds in new equity or equity-related offerings.

Sales of a substantial number of shares of our Class A common stock or other equity-related securities in the public market, including sales by any selling shareholder or conversion of our convertible notes, could depress the market price of our Class A common stock and impair our ability to raise capital through the sale of additional equity securities.

Our costs could increase and our revenues could decrease due to perceived health risks from RF energy.

The U.S. government imposes requirements and other guidelines relating to exposure to RF energy. Exposure to high levels of RF energy can cause negative health effects. The potential connection between exposure to low levels of RF energy and certain negative health effects, including some forms of cancer, has been the subject of substantial study by the scientific community in recent years. According to the FCC, the results of these studies to date have been inconclusive. However, public perception of possible health risks associated with cellular and other wireless communications media could slow the growth of wireless companies, which could in turn slow our growth. In particular, negative public perception of, and regulations regarding, health risks could cause a decrease in the demand for wireless communications services. Moreover, if a connection between exposure to low levels of RF energy and possible negative health effects, including cancer, were demonstrated, we could be subject to numerous claims. If we were subject to claims relating to exposure to RF energy, even if such claims were not ultimately found to have merit, our financial condition could be materially and adversely affected.

Our articles of incorporation, our bylaws and Florida law provide for anti-takeover provisions that could make it more difficult for a third party to acquire us.

Provisions of our articles of incorporation, our bylaws and Florida law could make it more difficult for a third party to acquire us, even if doing so would be beneficial to our shareholders. These provisions, alone or in combination with each other, may discourage transactions involving actual or potential changes of control, including transactions that otherwise could involve payment of a premium over prevailing market prices to holders of our Class A common stock, or could limit the ability of our shareholders to approve transactions that they may deem to be in their best interests.

ITEM 2. PROPERTIES

We are headquartered in Boca Raton, Florida, where we currently lease approximately 103,000 square feet of office space in multiple buildings. These leases expire at different dates extending through February 28, 2022. We have entered into long-term leases for regional and certain site development office locations where we expect our activities to be longer-term. We open and close project offices from time to time in connection with our site development business. We believe our existing facilities are adequate for our current and planned levels of operations and that additional office space suited for our needs is reasonably available in the markets within which we operate.

Our interests in towers are comprised of a variety of fee interests, leasehold interests created by long-term lease agreements, perpetual easements, easements, licenses, rights-of-way, and other similar interests. For the quarter ended December 31, 2012, approximately 70% of our tower sites were located on parcels of land that we own, land subject to perpetual easements, or parcels of land that have an interest that extends beyond 20 years. The average remaining life under our ground leases, including renewal options under our control, has been extended to 31 years. In rural areas, a wireless communications site typically consists of up to a 10,000 square foot tract, which supports towers, equipment shelters and related equipment. Less than 2,500 square feet is required for a monopole or self-supporting tower structure of the kind typically used in metropolitan areas for wireless communications tower sites. Land leases generally have an initial term of five years with five or more additional automatic renewal periods of five years, for a total of thirty years or more.

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ITEM 3. LEGAL PROCEEDINGS

We are involved in various legal proceedings relating to claims arising in the ordinary course of business. We do not believe that the ultimate resolution of these matters will have a material adverse effect on our business, financial condition, results of operations or liquidity.

ITEM 4. MINE SAFETY DISCLOSURE

Not Applicable.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market for our Class A Common Stock

Our Class A common stock commenced trading under the symbol “SBAC” on The NASDAQ National Market System on June 16, 1999. We now trade on the NASDAQ Global Select Market, a segment of the NASDAQ Global Market, formally known as the NASDAQ National Market System.

The following table presents the high and low sales price for our Class A common stock for the periods indicated:

As of February 16, 2013, there were 108 record holders of our Class A common stock.

Dividends

We have never paid a dividend on any class of common stock and anticipate that we will retain future earnings, if any, to fund the development and growth of our business. Consequently, we do not anticipate paying cash dividends on our Class A common stock in the foreseeable future. In addition, our ability to pay dividends is limited by the terms of our debt instruments.

Equity Compensation Plan

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ITEM 6. SELECTED FINANCIAL DATA

The following table sets forth selected historical financial data as of and for each of the five years ended December 31, 2012. The financial data for the fiscal years ended 2008, 2009, 2010, 2011, and 2012 have been derived from our audited consolidated financial statements. You should read the information set forth below in conjunction with our “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and the related notes to those consolidated financial statements included in this Form 10-K.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion of our financial condition and results of operations should be read in conjunction with the information contained in our consolidated financial statements and the notes thereto. The following discussion includes forward-looking statements that involve certain risks and uncertainties, including, but not limited to, those described in Item 1A. Risk Factors. Our actual results may differ materially from those discussed below. See “Special Note Regarding Forward-Looking Statements” and Item 1A. Risk Factors.

We are a leading independent owner and operator of wireless communications towers. Our principal operations are in the United States and its territories. In addition, we own and operate towers in Canada, Central America and South America. Our primary business line is our site leasing business, which contributed approximately 97.4% of our total segment operating profit for the year ended December 31, 2012. In our site leasing business, we lease antenna space to wireless service providers on towers and other structures that we own, manage or lease from others. The towers that we own have been constructed by us at the request of a wireless service provider, built or constructed based on our own initiative, or acquired. As of December 31, 2012, we owned 17,491 tower sites, the majority of which have been built by us or built by other tower owners or operators who, like us, have built such towers to lease space to multiple wireless service providers. We also managed or leased approximately 4,800 actual or potential communications sites, approximately 500 of which were revenue producing as of December 31, 2012. Our other business line is our site development business, through which we assist wireless service providers in developing and maintaining their own wireless service networks.

Site Leasing Services

Our primary focus is the leasing of antenna space on our multi-tenant towers to a variety of wireless service providers under long-term lease contracts in the United States, Canada, Central America and South America. Site leasing revenues are received primarily from wireless service provider tenants, including AT&T, Sprint, Verizon Wireless, T-Mobile, Digicel, Claro, and Telefonica. Wireless service providers enter into numerous different tenant leases with us, each of which relates to the lease or use of space at an individual tower site. In the United States and Canada our tenant leases are generally for an initial term of five to ten years with five 5-year renewal periods at the option of the tenant. These tenant leases typically contain specific rent escalators, which average 3-4% per year, including the renewal option periods. Tenant leases in our Central and South America markets typically have an initial term of 10 years with 5-year renewal periods. In Central America, we have similar rent escalators to that of leases in the United States and Canada while our leases in South America typically escalate in accordance with a standard cost of living index.

Cost of site leasing revenue primarily consists of:

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Ground leases are generally for an initial term of five years or more with multiple renewal terms of five year periods at our option and provide for rent escalators which typically average 3-4% annually or provide for term escalators of approximately 15%. Of the 17,491 tower sites we owned as of December 31, 2012, approximately 70% were located on parcels of land that we own, land subject to perpetual easements, or parcels of land in which we have a leasehold or other interest that extends beyond 20 years. For any given tower, costs are relatively fixed over a monthly or an annual time period. As such, operating costs for owned towers do not generally increase as a result of adding additional customers to the tower. The amount of direct costs associated with operating a tower varies from site to site depending on the taxing jurisdiction and the height and age of the tower. The ongoing maintenance requirements are typically minimal and include replacing lighting systems, painting a tower or upgrading or repairing an access road or fencing.

As indicated in the table below, our site leasing business generates substantially all of our total segment operating profit. For information regarding our operating segments, see Note 21 of our Consolidated Financial Statements included in this annual report.

We believe that over the long-term, site leasing revenues will continue to grow as wireless service providers lease additional antenna space on our towers due to increasing minutes of network use and data transfer, network expansion and network coverage requirements. We believe our site leasing business is characterized by stable and long-term recurring revenues, predictable operating costs and minimal non-discretionary capital expenditures. Due to the relatively young age and mix of our tower portfolio, we expect future expenditures required to maintain these towers to be minimal. Consequently, we expect to grow our cash flows by (1) adding tenants to our towers at minimal incremental costs by using existing tower capacity or requiring wireless service providers to bear all or a portion of the cost of tower modifications and (2) executing monetary amendments as wireless service providers upgrade their equipment. Furthermore, because our towers are strategically positioned and our customers typically do not relocate, we have historically experienced low tenant lease terminations as a percentage of revenue.

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Site Development Services

Our site development business, which is conducted in the United States only, is complementary to our site leasing business and provides us the ability to keep in close contact with the wireless service providers who generate substantially all of our site leasing revenue and to capture ancillary revenues that are generated by our site leasing activities, such as antenna and equipment installation at our tower locations. Site development services revenues are received primarily from providing a full range of end to end services to wireless service providers or companies providing development or project management services to wireless service providers. Our services include: (1) network pre-design; (2) site audits; (3) identification of potential locations for towers and antennas; (4) support in buying or leasing of the location; (5) assistance in obtaining zoning approvals and permits; (6) tower and related site construction; (7) antenna installation; and (8) radio equipment installation, commissioning and maintenance.

For information regarding our operating segments, see Note 21 of our Consolidated Financial Statements included in this annual report.

International Operations

As of December 31, 2012, we had operations in Canada, Costa Rica, El Salvador, Guatemala, Nicaragua, Panama, and Brazil. Our operations in these countries are solely in the site leasing business, and we expect to expand operations through new builds and acquisitions. Tenant leases in the Canadian market typically have similar terms and conditions as those in the United States, with an initial term of five years, and specific rent escalators. Tenant leases in Central America and Brazil typically have a ten year initial term. Tenant leases in Central America typically have similar renewal terms and rent escalators as those in the United States and Canada while those in Brazil are based on a standard cost of living index.

In our Central American markets, significantly all of our revenue, expenses, and capital expenditures arising from our new build activities are denominated in U.S. dollars. Specifically, our ground leases, our tenant leases and most of our tower related expenses are due, and paid, in U.S. dollars. In our Central American markets, our local currency obligations are principally limited to (1) permitting and other local fees, (2) utilities and (3) taxes. In our Canadian and Brazilian operations, significantly all of our revenue, expenses and capital expenditures, including tenant leases, ground leases and other tower-related expenses, are denominated in local currency.

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Critical Accounting Policies and Estimates

We have identified the policies and significant estimation processes below as critical to our business operations and the understanding of our results of operations. The listing is not intended to be a comprehensive list. In many cases, the accounting treatment of a particular transaction is specifically dictated by accounting principles generally accepted in the United States, with no need for management’s judgment in their application. In other cases, management is required to exercise judgment in the application of accounting principles with respect to particular transactions. The impact and any associated risks related to these policies on our business operations is discussed throughout “Management’s Discussion and Analysis of Financial Condition and Results of Operations” where such policies affect reported and expected financial results. For a detailed discussion on the application of these and other accounting policies, see Note 2 of our Consolidated Financial Statements for the year ended December 31, 2012, included herein. Our preparation of our financial statements requires us to make estimates and assumptions that affect the reported amount of assets and liabilities, disclosure of contingent assets and liabilities at the date of our financial statements, and the reported amounts of revenue and expenses during the reporting periods. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. There can be no assurance that actual results will not differ from those estimates and such differences could be significant.

Revenue Recognition and Accounts Receivable

Revenue from site leasing is recorded monthly and recognized on a straight-line basis over the current term of the related lease agreements, which are generally five to ten years. Receivables recorded related to the straight-lining of site leases are reflected in other assets on the Consolidated Balance Sheets. Rental amounts received in advance are recorded as deferred revenue on the Consolidated Balance Sheets.

Site development projects in which we perform consulting services include contracts on a time and materials basis or a fixed price basis. Time and materials based contracts are billed at contractual rates as the services are rendered. For those site development contracts in which we perform work on a fixed price basis, site development billing (and revenue recognition) is based on the completion of agreed upon phases of the project on a per site basis. Upon the completion of each phase on a per site basis, we recognize the revenue related to that phase. Site development projects generally take from 3 to 12 months to complete.

Revenue from construction projects is recognized on the percentage-of-completion method of accounting, determined by the percentage of cost incurred to date compared to management’s estimated total cost for each contract. This method is used because management considers total cost to be the best available measure of progress on the contracts. These amounts are based on estimates, and the uncertainty inherent in the estimates initially is reduced as work on the contracts nears completion. The asset “costs and estimated earnings in excess of billings on uncompleted contracts” represents costs incurred and revenues recognized in excess of amounts billed. The liability “billings in excess of costs and estimated earnings on uncompleted contracts,” included within other current liabilities on our Consolidated Balance Sheets, represents billings in excess of costs incurred and revenues recognized. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined to be probable.

On October 31, 2011, we entered into a Master Amendment with one of our wireless service provider customers. The Master Amendment serves as a separate amendment to each individual existing tenant lease agreement that we are currently a party to with that customer. Among other items, the Master Amendment (1) extends the current term of the individual leases, (2) permits the customer limited early termination rights which will be exercisable over a multi-year period, commencing in the second half of 2013, on a specific number of the existing leases, (3) allows the customer to make certain specific equipment changes at the tower sites in exchange for an increase in monthly rental payment due from the customer, and (4) slightly modifies the existing monthly lease rates of certain leases. The customer’s early termination rights are limited with respect to the aggregate

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number of leases that may be terminated and the number that may be terminated in any quarter. The specific leases to be terminated early and the timing of such terminations has not been determined as of the date of this filing. As a result, for accounting and financial statement purposes, we have made assumptions with regard to the leases to be terminated and the timing of the terminations. We have assumed that the customer will terminate the maximum number of leases allowable in each quarter, selecting the highest rental rate leases at the earliest allowable dates. We believe that these assumptions will ensure that only the minimum known revenue for the pool of leases covered by the Master Agreement will be accrued on a straight-line basis. Our balance sheet and statement of operations reflect these assumptions. The actual leases that the customer terminates and the timing and number of terminations may or may not be those that we have identified in our assumptions. We will monitor actual results and elections under the Master Amendment and record any differences from previously made assumptions on a quarterly basis. To the extent that the actual results materially differ from the assumptions made, we will disclose the impact of these adjustments.

We perform periodic credit evaluations of our customers. We monitor collections and payments from our customers and maintain a provision for estimated credit losses based upon historical experience, specific customer collection issues identified, and past due balances as determined based on contractual terms. Interest is charged on outstanding receivables from customers on a case by case basis in accordance with the terms of the respective contracts or agreements with those customers. Amounts determined to be uncollectible are written off against the allowance for doubtful accounts in the period in which uncollectibility is determined to be probable.

Asset Impairment

We evaluate individual long-lived and related assets with finite lives for indicators of impairment to determine when an impairment analysis should be performed. We evaluate our tower assets and current contract intangibles at the tower level, which is the lowest level for which identifiable cash flows exists. We evaluate our network location intangibles for impairment at the tower leasing business level whenever indicators of impairment are present. We have established a policy to at least annually evaluate our tower assets and current contract intangibles for impairment.

We record an impairment charge when we believe an investment in towers or related assets has been impaired, such that future undiscounted cash flows would not recover the then current carrying value of the investment in the tower site and related intangible. Estimates and assumptions inherent in the impairment evaluation include, but are not limited to, general market and economic conditions, historical operating results, geographic location, lease-up potential and expected timing of lease-up. In addition, we make certain assumptions in determining an asset’s fair value for the purpose of calculating the amount of an impairment charge.

Property Tax Expense

We typically receive notifications and invoices in arrears for property taxes associated with the tangible personal property and real property used in our site leasing business. As a result, we recognize property tax expense, which is reflected as a component of site leasing cost of revenue, based on our best estimate of anticipated property tax payments related to the current period. We consider several factors in establishing this estimate, including our historical level of incurred property taxes, the location of the property, our awareness of jurisdictional property value assessment methods and industry related property tax information. If our estimates regarding anticipated property tax expenses are incorrect, a future increase or decrease in site leasing cost of revenue may be required.

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KEY PERFORMANCE INDICATORS

Non-GAAP Financial Measures

This report contains certain non-GAAP measures, including Segment Operating Profit and Adjusted EBITDA information. We have provided below a description of such non-GAAP measures, a reconciliation of such non-GAAP measures to their most directly comparable GAAP measures and an explanation as to why management utilizes these measures.

Segment Operating Profit:

We believe that Segment Operating Profit is an indicator of the operating performance of our site leasing and site development segments and is used to provide management with the ability to monitor the operating results and margin of each segment, while excluding the impact of depreciation, accretion and amortization, which is largely fixed and non-cash in nature. Segment Operating Profit is not intended to be an alternative measure of revenue or segment gross profit as determined in accordance with GAAP.

The increase in site leasing segment operating profit of $172.8 million in 2012 is primarily due to additional profit generated by the towers that we acquired or constructed in the latter half of 2011 and during the year ended December 31, 2012, organic site leasing growth from new leases, contractual rent escalators, and lease amendments with current tenants which increased the related rent to reflect additional equipment added to our towers, control of our site leasing cost of revenue, and the positive impact of our ground lease purchase program.

The increase in site leasing segment operating profit of $68.1 million in 2011 is primarily related to additional profit generated by the revenues from the towers that we acquired or constructed in the latter half of 2010 and subsequent to December 31, 2010, organic site leasing growth from new leases, contractual rent escalators, and lease amendments with current tenants which increased the related rent to reflect additional equipment added to our towers in the year ended December 31, 2011, control of our site leasing cost of revenue, and the positive impact of our ground lease purchase program.

The increase in site development segment operating profit of $6.6 million in 2012 is primarily due to the higher volume of work performed compared to the prior year associated with the deployment of next generation networks by wireless carriers including Sprint’s Network Vision initiative.

Each respective Segment Operating Profit is defined as segment revenues less segment cost of revenues (excluding depreciation, accretion and amortization). Total Segment Operating Profit is the total of the operating profits of the two segments. The reconciliation of Segment Operating Profit is as follows:

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