 It was not until 1977 that a policy was promulgated that would allow for designation of National Historic Landmark "whose primary significance is not related to its park's purpose".The Jacob Riis House in Queens was de-designated in 1973.The National Park Service identifies 18 historic sites within national park units in New York State, and lists these together with the NHLs in the state, and there are also two National Historic Sites that are "affiliated areas," receiving National Park Service support but not directly administered by it.