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.

Completed in 1909 at the northeast corner of West 107th Street and Riverside Drive, the three-story, 12,000 square foot mansion was designed in neo-French-Renaissance style by William Tuthill.

After that the mansion changed hands several times until 1979 when Hans Smit, a Columbia University law professor, bought it and commissioned an extensive interior restoration.

[3] The structure was designated a New York City Landmark on March 19, 1974, and added to the National Register of Historic Places on April 23, 1980.

Although there are a handful of single-family mansions along Riverside Drive, the prediction for this kind of development never reached its full potential.

The Riverside Drive – West 105th Street Historic District, a block south, is made up of rowhouses and townhouses built between 1889 and 1902.

Being completely detached allows the mansion to take advantage of treating all four sides of the building and also to create spaces such as a typical English basement.

When built there was a tunnel connecting the English basement of the mansion under Riverside Drive to the banks of the Hudson River.

Its use has ranged from a private girls finishing school to a daycare center to a location for law students gatherings.

[3] It has also been used as the home to June, the wife of a late conman, who rents the studio apartment to the fictional character Neal Caffrey in the popular USA Network show White Collar.

As this prediction never came to fruition, the Schinasi mansion remains the largest single-family residence along Riverside Drive.

In 1928 Schinasi died at the age of seventy-one, and two years later his heirs sold the house to Semple Realty Corporation for $200,000.

The Landmarks Preservation Commission found that this residence had “special character, special historical and aesthetic interest, and value as part of the development, heritage, and cultural characteristics of New York City.”[2] During Smit's ownership, he never actually lived in the building, yet his brother's family did for several years during this time period.

Mark Schwartz, a vice chairman at the investment bank Goldman Sachs, bought the Schinasi House in 2013.