350 Park Avenue © DBOX for Foster + PartnersBillionaire Ken Griffin’s proposed 1,600-foot office tower at 350 Park Avenue will be built after the City Council unanimously approved the building last week. The tower will deliver 1.8 million square feet of office space anchored by Griffin’s Citadel and Citadel Securities, plus a new public concourse. The huge building will rise 200 feet taller than JPMorgan Chase’s headquarters at 270 Park Avenue, also designed by Foster + Partners. The structures include a 30-story Vornado-owned office tower at 350 Park Avenue, a 23-story Rudin-owned office building at 40 East 52nd Street, and a five-story office building at 39 East 51st Street. Citadel and its affiliate Citadel Securities will occupy at least 850,000 square feet of the tower.