Rarely available, this terraced penthouse four-bedroom, three-bathroom duplex "in the sky" must be seen to be believed.

Situated on the southeast corner of the building, and boasting open city and river views, the home is sun-flooded all day long. The flow and layout are exceptional, providing for gracious everyday living or entertaining on a grand scale.

The main living space is anchored by a wonderful great room that flows seamlessly to a charming south-facing terrace - an idyllic setting for morning coffee, sunset cocktails, or simply taking in the city skyline. The windowed kitchen is perfectly positioned for entertaining, while a spacious bedroom on the main floor easily doubles as a den, home office, or au pair's living space, complemented by its own full bathroom. A cozy reading nook is tucked behind the staircase, creating the perfect spot to unwind with your favorite book.

The upstairs wing is dedicated to the private living quarters. The corner primary suite enjoys spectacular light and river views, generous California Closets, and a luxurious five-piece en-suite bathroom. Two additional oversized bedrooms share a convenient full bathroom, providing comfortable privacy for family or guests alike. The upper floor also offers easy access for bringing in suitcases when you're coming home from vacation, through its own door to the building's hallway.

Refined finishes throughout include richly stained red oak floors, a striking built-in bookcase wall unit, central forced-air heat and air conditioning, an in-unit washer-dryer, and exceptional storage.

Built in 1963, The Gracie Towne House is a well-run full-service post-war cond-op building that provides flexibility of ownership, unlimited subletting, no ground lease, and NO BOARD APPROVAL for owners. Owners also have the ability to convert their cooperative shares into condominium ownership: a highly coveted rarity in Manhattan.

Building features include a 24-hour door staff, live-in superintendent, fitness center, private and bike storage, laundry room on the floor, on-site parking garage, and a package room with refrigerator storage. And yes, pets are permitted.

Perfectly located moments from Carl Schurz Park, Asphalt Green, and the East River Esplanade, the building offers the very best of Upper East Side living with convenient access to the Second Avenue Q train at 86th Street, the NYC Ferry's East 90th St. stop, a grocery store and kosher market directly across the street, as well as coffee shops, neighborhood dining, shopping and recreation.

Combining breathtaking views, the finest indoor-outdoor living, remarkable flexibility, and outstanding value, this penthouse opportunity is a rarity that only comes around once.