731 Lexington Avenue is a 1,345,489 sq ft mixed-use 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 condo…731 Lexington Avenue is a 1,345,489 sq ft mixed-use 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.