Replacing the William A. Clark Mansion, 960 Fifth Avenue is one of Candela's most complex projects-"literally," according to The New York Times, "12 mansions built one on top another." Although the corner building appears to be one large volume, it actually comprises two sections, each defined by subtle variations in decorative details. One section, with the Fifth Avenue address, features a mixture of duplex and simplex units sold as co-operatives. The most expensive apartment, a duplex that contained a double-height, 58-foot living room, sold for the then-record price of $450,000, or about $6.5 million today. The building's second section, with a separate entrance at 3 East 77th Street, was made up of smaller apartments, intially rental but now a co-op.