AMERICAN TOWER CORPORATION
American Tower Corporation was created as a subsidiary of American Radio Systems Corporation in 1995 to own, manage, develop and lease
communications and broadcast tower sites, and was spun off into a free-standing public company in 1998. Since inception, we have grown our communications real estate portfolio through acquisitions, long-term lease arrangements, development and
construction, and through mergers with, and acquisitions of, other tower operators.
To effect our conversion to a REIT for
federal income tax purposes, effective December 31, 2011, American Tower Corporation merged with and into its wholly owned subsidiary, American Tower REIT, Inc. American Tower REIT, Inc., the surviving corporation, was renamed American Tower
Corporation and, since January 1, 2012, has qualified as a REIT for federal income tax purposes.
American Tower Corporation
is a holding company, and we conduct our operations through our directly and indirectly owned subsidiaries and joint ventures. Our principal domestic operating subsidiaries are American Towers LLC and SpectraSite Communications, LLC. We conduct our
international operations primarily through our subsidiary, American Tower International, Inc., which in turn conducts operations through its various international operating subsidiaries and joint ventures.
Our principal executive office is located at 116 Huntington Avenue, Boston, Massachusetts 02116. Our main telephone number at that
address is (617) 375-7500.
Investing in the offered securities involves risks. Before deciding to invest in our securities, you should carefully consider the
discussion of risks and uncertainties under the heading Risk Factors contained in any applicable prospectus supplement and in the documents that are incorporated by reference in this prospectus. See the section entitled Where You
Can Find More Information on page 62.