54 story mixed-use office and residential building in midtown Manhattan. 29-story steel-framed podium provides space for corporate offices and retail venues. The 30th floor incorporates a structural transition to reinforced concrete construction for the slender residential tower above. The building is 850 feet tall. A 600-ton Tuned Mass Damper (TMD) at the top of the building helps to control movement of the tower due to wind forces. (The building got Emporis award 2005). * Prior Affiliation