In New York City, public parks, or, as the New York City Zoning Resolution of 1961 reads, “any publicly owned park, playground, beach, parkway or roadway within the jurisdiction and control of the Commissioner of Parks” are special.
They’re exempt from zoning laws and don’t generate usable floor area. In other words, developers can’t build on them. As the City Charter reads, “The rights of the city in and to its … public parks … are inalienable.” Only an act of the State Legislature can strip them of their protected status and free them for other purposes.