One57, formerly known as Carnegie 57, is a 75-story, 1,005 ft (306 m) supertall skyscraper at 157 West 57th Street between Sixth and Seventh Avenues in the Midtown neighborhood of Manhattan, New York City. The building has 92 condominium units above a 210-room Park Hyatt Hotel that serves as the flagship Hyatt property. The tower was developed by Extell Development Company and designed by Christian de Portzamparc. It is the first ultra-luxury condominium tower along a stretch of 57th Street called Billionaires' Row.