Coordinates: 41°38′14″N 73°34′20″W / 41.63734°N 73.57229°W / 41.63734; -73.57229 Harlem Valley State Hospital, south of the hamlet of Wingdale in the Town of Dover, was a New York State psychiatric hospital that operated from 1924-1994.
The grounds were originally slated to be a correctional facility, Wingdale Prison, but complaints by the local population caused a re-purposing of the buildings (under construction) into a state hospital. It is located on NY 22/55 opposite the Harlem Valley-Wingdale station on the Metro-North Harlem Line.
The hospital was closed in 1994 due to budget cuts. In 2013, the property was purchased by Olivet Management, which renamed the complex the Olivet Center and plans to renovate it into space for retail and hi-tech industry.