350 Park Avenue is a planned supertall office tower in Midtown Manhattan, New York City, designed by Foster + Partners[1] and developed by Vornado Realty Trust and Rudin Management.

[6] The Foster and Partners design featuring angular, glass-curtain wall facades and twin spires that would reach an estimated height of almost 1,500 feet (460 m).

[9][10] To permit the additional height, Citadel and Rudin Management would acquire development rights from the nearby St. Bartholomew's Episcopal Church and St. Patrick's Cathedral.

The building's proposed 1,800,000 square feet (170,000 m2) of commercial floor space is made possible in part by Citadel and Vornado's purchase of air rights from St. Patrick's Cathedral[13] and Saint Bartholomew's Church.

[5] The tower's design includes a 12,500-square-foot open-air public concourse located along Park Avenue with office floors raised above it, providing green space, seating, and greater visibility of surrounding landmarks such as the Racquet and Tennis Club building and St Bartholomew's Episcopal Church.