Bedrooms: 1 Bathrooms: 1 Square feet: 800 Maintenance: $1,060 — The “warmth” of this prewar “masterpiece” on lower Park Avenue has been maintained, but just about everything else has been updated for the 21st century. This includes an expanded state-of-the-art kitchen, a new, Italian-tiled bathroom with a Jacuzzi tub and custom-fitted closets throughout. Agents: Cheryl Greenberg and Gregory Olson, A.C. Lawrence & Co., 646-619-3749 and 646-619-3762