Item 2. Properties
ITEM 2. PROPERTIES
As of December 31, 2021, we owned and operated a portfolio of 220,131 communications sites, including 1,778 DAS networks. See the table in Item 7 of this Annual Report, under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Executive Overview” for more detailed information on the geographic locations of our communications sites. In addition, we own property interests that we lease to communications service providers and third-party tower operators in Canada and the United States, which are included in our U.S. & Canada property segment, and in Australia, which are included in our Asia-Pacific property segment, and also own and operate data center facilities and related assets in the United States, which are included in our Data Centers segment.
Our interests in our communications sites consist of a variety of ownership interests, including leases created by long-term ground lease agreements, easements, licenses or rights-of-way granted by government entities.
A typical tower site consists of a compound enclosing the tower site, a tower structure and, in some cases, one or more equipment shelters that house a variety of transmitting, receiving and switching equipment. In addition, many of our international sites typically include power generators and batteries, which are often used for primary power in lieu of an electric grid connection in select markets. The principal types of our towers are guyed, self-supporting lattice and monopole, and rooftop towers in our international markets.
• A guyed tower includes a series of cables attaching separate levels of the tower to anchor foundations in the ground and can reach heights of up to 2,000 feet. A typical guyed broadcast tower can be located a tract of land of up to 20 acres.
• A self-supporting lattice tower typically tapers from the bottom up and usually has three or four legs. A lattice tower can reach heights of up to 1,000 feet, although most lattice structures are between 200 and 400 feet. Depending on the height of the tower, a lattice tower site can be located on a tract of land of 10,000 square feet for a rural site or fewer than 2,500 square feet for a metropolitan site.
• A monopole tower is a tubular structure that is used primarily to address space constraints or aesthetic concerns. Monopoles typically have heights ranging from 50 to 200 feet. A monopole tower site used in metropolitan areas for a typical wireless communications tower can be located on a tract of land of fewer than 2,500 square feet.
20
Table of Conten ts
• Rooftop towers are primarily used in metropolitan areas in our Asia-Pacific, Africa, Europe and Latin America markets, where locations for traditional tower structures are unavailable. Rooftop towers typically have heights ranging from 10 to 100 feet.
U.S. & Canada Property Segment Encumbered Sites . As of December 31, 2021, the loan underlying the securitization transactions completed in March 2013 and March 2018 (the “2013 Securitization” and the “2018 Securitization”, respectively, and together, the “Trust Securitizations”) is secured by mortgages, deeds of trust and deeds to secure the loan on substantially all of the 5,113 broadcast and wireless communications towers and related assets owned by the borrowers (the “Trust Sites”) and the secured revenue notes issued in a private transaction completed in May 2015 (the “2015 Securitization”) are secured by mortgages, deeds of trust and deeds to secure debt on substantially all of the 3,531 communications sites owned by subsidiaries of the issuer (the “2015 Secured Sites”).
There are no encumbered sites in our Asia-Pacific, Africa, Europe or Latin America property segments or in our Data Centers segment.
Ground Leases. Of the 218,353 towers in our portfolio as of December 31, 2021, approximately 90% were located on land we lease. Typically, we seek to enter long-term ground leases, which have initial terms of approximately five to ten years with one or more automatic or exercisable renewal periods. As a result, 41% of the ground leases for our sites have a final expiration date of 2031 and beyond.
Customers . Our customers are primarily wireless service providers, broadcasters and other companies in a variety of industries. For the year ended December 31, 2021, our top three customers by total revenue were T-Mobile (20%), AT&T (19%) and Verizon Wireless (13%).
Across most of our markets, our tenant leases for our communications sites with wireless carriers have initial non-cancellable terms of five to ten years with multiple renewal terms. As a result, approximately 64% of our current tenant leases have a renewal date of 2027 or beyond.
Data Centers. We own and operate data center facilities and related assets, and as of December 31, 2021, our data center portfolio consisted of 27 data center facilities across ten United States markets, including the assets acquired as part of the CoreSite Acquisition, as well as our previously acquired data center facilities, across 3.1 million net rentable square feet (“NRSF”).
Offices. Our principal corporate headquarters is leased and located in Boston, Massachusetts, where we currently lease approximately 40,000 square feet of office space. We also own or have entered into long-term leases for the majority of our facilities in international and regional locations for the management and operation of our property and services businesses, including offices in each of our U.S. & Canada, Asia-Pacific, Africa, Europe, Latin America and Data Centers segments. Our international headquarters is leased and located in Amsterdam, Netherlands. We believe that our owned and leased facilities are suitable and adequate to meet our anticipated needs.