The Sony Tower (also Sony Plaza, formerly the AT&T Building), is a 647 feet (197 m) tall, 37-story highrise skyscraper located at 550 Madison Avenue between 55th Street and 56th Street in the New York City borough of Manhattan. It is currently the headquarters of Sony Corporation of America. The building was designed by architect Philip Johnson and partner John Burgee, completed in 1984, and close - in concept - to the 1982 Humana Building by Michael Graves.