The Apthorp is a historic condominium apartment building in New York City, New York. The Renaissance Revival building designed by architects Clinton & Russell for absentee landowner William Waldorf Astor was built between 1906 and 1908; it occupies the full block between Broadway and West End Avenue and between 78th and 79th Streets. The building is built around a large interior courtyard. It is a city landmark and was added to the National Register of Historic Places in 1978.
The building was named for Charles Ward Apthorp, who owned Apthorp Farm, which encompassed about 300 acres (1.2 km2) in this part of Manhattan in the late 18th century.
A three-story rusticated base and the rustication of the broader corner bays as well as string moldings serve together to articulate the otherwise block-like mass. Arch-headed windows contrast with rectangular ones to emphasize lightly certain positions, notably the enriched uppermost floor under the projecting cornice. Over-lifesize limestone sculptures representing the Four Seasons stand above the central barrel-vaulted entrance, where the elaborate wrought-iron gates in the manner of Samuel Yellin feature a pair of gazelle heads.
In 2008 the building, which had been rental, became a condominium. The asking prices, nearly $3,000 a square foot, or an average of $6.5 million per apartment, make it "one of the most expensive condominium conversion projects" ever, according to the New York Times.
Residents have included Nora Ephron, Al Pacino, Conan O'Brien, Cyndi Lauper, Rosie O'Donnell, and Steve Kroft.