American Tower (American (AMT), the independent owner, operator and developer of wireless and broadcast communications sites in many countries around the world, was founded in 1995 as a division of the radio system and headquartered in Boston, Massachusetts; in 1998, it divested itself of the radio system, acquired CBS Corporation and began to expand its business; today, American Tower has become a real estate investment trust The company was ranked No. 890 in the 2014 Global 2000.