The Nathaniel L. McCready House, also known as the Harkness Mansion, is a mansion at 4 East 75th Street on the Upper East Side of New York City. Completed in 1896 for Nathaniel L’Hommediue McCready Jr., during the twentieth century it was occupied by Thomas J. Watson, Rebekah Harkness, whose name became associated with the building when she used it as the offices of the Harkness Ballet. In 2011, the home was purchased by Larry Gagosian, who demolished the mansion's interior.