High Quality Content by WIKIPEDIA articles! The Historic House Trust of New York City was formed in 1989 as a public-private partnership with the New York City Department of Parks & Recreation to preserve the historic houses located within New York City parks, although most of the houses were not originally city-owned. The Trust works with the individual houses to restore and promote the houses as a means of educating residents and visitors about the social, economic and political history of New York City and cast urban history in a new light. The Trust includes 23 historic sites, with 18 operating as museums and attracting 729,000 annual visitors.