Kykuit, known also as the John D. Rockefeller Estate, is a 40-room National Trust house in Westchester County, New York, built by order of oil tycoon, capitalist and Rockefeller family patriarch John D. Rockefeller. Conceived largely by his son, John D. Rockefeller, Jr., and enriched by the art collection of third-generation scion, Governor of New York and Vice President of the United States, Nelson Rockefeller, it has been home to four generations of the family.