[5] In 2007, an additional 368 acres (1.49 km2) of former hospital property were added to Nissequogue River State Park.

At the time of the transfer, 90 acres (0.36 km2) of the property that included the hospital's former buildings remained to be cleaned up and redeveloped, however plans called for development to be consistent with the surrounding parkland.

[9] Recreational opportunities at the park include soccer, bird watching, fishing, canoeing/kayaking, hiking, biking, and guided tours.

The conservation area particularly aims to protect feeding and roosting habitat for wading birds such as egrets and herons.

Other notable buildings include York Hall (Building 80), the hospital's main auditorium and theater, which has been on the National Register of Historic Places since October 23, 2023.