320 East 23rd Street AKA New Amsterdam is a post-war doorman rental building in downtown Manhattan's Gramercy Park neighborhood. Built in 1965, New Amsterdam rises 16 stories and offers 210 units. The elevatored 24-hour doorman building's amenities also include a live-in superintendent, on-site garage and laundry, bike room, and a furnished rooftop sundeck with spectacular views of the city and East River.