550 Madison Avenue, once the AT&T Building, stands between 55th and 56th Streets in Midtown. Philip Johnson and John Burgee designed it for AT&T. Construction began in late 1978, it topped out on November 18, 1981, and it was completed in 1984, at a cost of $200 million. The article calls the style Postmodern.
The tower is 647 feet (197 meters) tall with 37 stories and no setbacks. Its facade uses about 60,000 pieces of pink Stony Creek granite. A 116-foot entrance arch fronts Madison Avenue, and a broken pediment with a circular opening crowns the roof.
The exterior was designated a New York City landmark on July 31, 2018. Snøhetta redesigned the base for Olayan, finishing in 2023.

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