The 216-acre property is home to four former Gilded Age homes of the Gould and Guggenheim families, now owned by Nassau County and operated by the Sands Point Conservancy.

The Lyndhurst mansion was designed by Alexander Jackson Davis in the Gothic Revival-style. The 67-acre estate landscape design was the work of Ferdinand Mangold. The Tarrytown estate had three resident families: the Pauldings, the Merritts and the Goulds.