Question: Stillman House follows the demonstration that now sits at which 40-room National Trust house?
Sentence (from "Kykuit"): 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.
Relevant evidence: Yes