American Tower Corporation is a holding company. The Company conducts its operations through its directly and indirectly owned subsidiaries and joint ventures. It is a wireless and broadcast communications infrastructure company that owns, operates and develops communications sites. Its primary business includes leasing antenna space on multi-tenant communications sites to wireless service providers, radio and television broadcast companies, wireless data providers, government agencies and municipalities and tenants in a number of other industries. This business is its rental and management operations, which accounted for approximately 98% of its total revenues during the year ended December 31, 2011. In January 2012, the Company merged with and into American Tower REIT, Inc. In October 2013, the Company acquired MIP Tower Holdings LLC. In November2013, NII Holdings, Inc sold 1,483 communications sites in Mexico to American Tower Corporation.