American Tower is a holding company. Through its subsidiaries, Co. is a real estate investment trust and an independent owner, operator and developer of multitenant communications real estate. Co.'s business is the leasing of space on 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. Co. also provides tower-related services in the U.S. These services include site application, zoning and permitting and structural analysis, which primarily support Co.'s site leasing business, including the addition of new tenants and equipment on its sites.