731 Lexington Avenue is a 1,345,489 sq ft (125,000.0 m2) glass skyscraper on the East Side of Midtown Manhattan, New York City. 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 residences are known as One Beacon Court and are served by a separate entrance. The tower is the 15th tallest building in New York City and the 46th tallest in the United States. It stands at 55 stories tall, reaching 806 ft (246 m).
Construction on 731 Lexington Avenue began in 2001, three years after the vacant Alexander’s department store was demolished. The building was developed by Vornado Realty Trust and César Pelli & Associates served as the design architect. The building comprises a full city block between Lexington and Third Avenues and 58th and 59th Streets. The complex features two towers constructed above a steel office and retail section, separated by a seven-story atrium. The residences are known as One Beacon Court and are served by a separate entrance. The design of the courtyard at One Beacon Court, which connects 58th and 59th Streets, was inspired by other historic New York enclosures such as Grand Central Terminal, the reading room of the New York Public Library Main Branch, and the skating rink at Rockefeller Center; glass walls curve around the perimeter of the courtyard, tilting slightly inward as they rise.