The Schinasi House is a 12,000-square-foot (1,100 m2), 35-room marble mansion located at 351 Riverside Drive on the Upper West Side of Manhattan in New York City. It was built in 1907 for Sephardic Jewish tobacco baron Morris Schinasi. The mansion was designed by Carnegie Hall architect William Tuthill and reportedly retains almost all of its historic detail, including a Prohibition-era trap door that once extended all the way to the river.