New York City Parks
Even though Central Park is the most popular and massive parks in Manhattan, there are other parks worth to mention. The most unique of them is Gramercy Park, one of only two private parks in New York City. The park is located between East 20th and 21st Streets at the foot of Lexington Avenue and only people who reside around the park are allowed there. Only residents of buildings surrounding the park have a key, the public is otherwise only allowed in the park one day a year. However, if you are staying in Gramercy Park Hotel, you are in luck – the concierge will provide you with a key, so during your staying in the hotel you can enjoy this private park as a real resident of this historic neighborhood.
Full article at New York City Parks