Demolition has begun at 350 Park Avenue, the site of a 1,414-foot supertall office skyscraper in Midtown East, Manhattan. Designed by Foster + Partners and developed by Vornado Realty Trust, Rudin, and Ken Griffin, the 64-story structure will yield 1.8 million square feet of Class A office space with a capacity of 6,000 employees. Griffin's companies Citadel and Citadel Securities will serve as the anchor tenants, occupying at least 850,000 square feet. The 53,000-square-foot