Edda Elias injects a fun, fresh aesthetic into a 3,700-square-foot, old-world apartment in the landmarked Apthorp. The layout of the three-bedroom residence was already ideal, with public rooms up front and private rooms in the rear. Further, the surviving interior craftsmanship, north- and south-facing exposures, and 10.8-foot-high ceilings were hard to rival. (New York Spaces)