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.
[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.