The MetLife Building is a 59-story skyscraper at 200 Park Avenue at East 45th Street above Grand Central Terminal in Midtown Manhattan, New York City. Built in 1960–63 as the Pan Am Building, the then-headquarters of Pan American World Airways, it was designed by Emery Roth & Sons, Pietro Belluschi and Walter Gropius in the International style. The world's largest commercial office space by square footage at its opening, it remains one of the fifty tallest buildings in the United States.