The Apthorp is a historic condominium apartment building in Manhattan, New York City. The Italian Renaissance Revival building designed by architects Clinton & Russell for William Waldorf Astor, was built between 1906 and 1908; it occupies the full block between Broadway and West End Avenue and between West 78th and West 79th streets. The building, which has been called "Monumental and magnificent", is built around a large interior courtyard.