The building, an elegant Beaux-Arts tower, was one of the most painful losses of the early preservation movement when it was razed in 1967.... Begun in 1906, the Singer Building incorporated Flagg's model for a city of towers, with the 1896 structure reconstructed as the base, and a 65-foot-square shaft rising 612 feet high, culminating in a bulbous mansard and giant lantern at the peak."