731 Lexington Avenue is a 1,345,489 sq ft (125,000.0 m2) glass skyscraper on Lexington Avenue, on the East Side of Midtown Manhattan, New York City. Opened in 2004, it houses the headquarters of Bloomberg L.P. and as a result, is sometimes referred to informally as Bloomberg Tower. The building also houses retail outlets, restaurants and 105 luxury condominiums. The residence section of the building is known as One Beacon Court and is served by a separate entrance. The tower is ranked 24th on the list of tallest buildings in New York City and is ranked 46th on the list of tallest buildings in the United States. It stands at 55 stories tall, reaching 806 ft (246 m).The building occupies the former site of an Alexander's department store and is owned by the Alexander's real estate investment trust, the successor to the defunct retail chain.