William Kissam Vanderbilt (1849–1920) had three houses designed by Richard Morris Hunt. His townhouse, the "Petit Château" at 660 Fifth Avenue, New York, with details drawn in part from the late-Gothic Hôtel de Cluny, Paris, proved an influential example for other Gilded Age mansions, but was demolished in 1926.
BIG OLD HOUSES: A Vanderbilt house on Fifth Avenue
A Guide to the Gilded Age Mansions of 5th Avenue's Millionaire Row
Side chair for the Library of the William H. Vanderbilt House Maker: Herter Brothers (1864–1906) Date: 1881–82 Geography: Mid-Atlantic, New York, New York, United States Culture: American Medium: rosewood, inlaid with brass and mother-of-pearl
Cornelius Vanderbilt II purchased and demolished 3 brownstone houses on the southwest corner of 57th Street and 5th Avenue in preparation for his new mansion. Description from pinterest.com. I searched for this on bing.com/images