Nassau Hall is a historic mansion on the grounds of the Muttontown Preserve in Muttontown, New York. It was built in 1904 for Bronson Winthrop and was known as Muttontown Meadows.[1] It was the first commission of Delano and Aldrich in the area. Its exterior walls were modeled after Mount Vernon, and was on an estate of 183 acres.[2]
It was purchased by Lansdell Christie in 1950, who sold it to Nassau County in 1969, becoming the headquarters of the Nassau Parks Conservancy. It was restored in 2010.[2] It is one of three mansions in the Muttontown Preserve, along with the Benjamin Moore Estate, also known as Chelsea, and the destroyed Knollwood Estate.[1]