The Williams-Butler House, also known as the Jacobs Executive Development Center, is a roughly 16,000 sq. ft. mansion located in Buffalo, New York, that was built between 1896 and 1899. The house was designed by architect Stanford White of the New York firm of McKim, Mead and White for George L. Williams and his wife Annie. The building is a contributing property to the Delaware Avenue Historic District designated in 1974.