This spectacular duplex penthouse offers incredible views and light from the top of an elevatored townhouse mansion! The dramatic corner living room is illuminated by stunning vaulted ceilings with remarkable angular skylights, as well as a wood-burning fireplace with custom stained glass mantel. Double glass doors lead to the spacious corner terrace with Hudson River and open city views, and plenty of room for outdoor dining. Corner south and west exposures welcome light throughout the day, and modern white concrete floors add to the uncommon sense of light and air. The generous dining area is surrounded by floor-to-ceiling windows, with ample room for formal dining or casual gatherings. The luxurious open kitchen has been expertly outfitted with SieMatic custom cabinetry, including an impressive pantry and ingenious storage throughout. Seamlessly integrated appliances include the Sub-Zero refrigerator with two freezer drawers, two Gaggenau ovens, Gaggenau electric range, Sub-Zero wine refrigerator and two separate beverage refrigerator drawers, and the Miele dishwasher. The living room has been outfitted with Dolby 5.1 surround sound, and the entire residence benefits from through-wall air conditioning. Above it all, the sun-flooded mezzanine is currently configured as an office area with impressive views and integrated storage. The bedroom wing has been completely reconfigured and renovated, with custom Poliform closets, Norwegian pickled white oak floors, and new windows throughout. The serene corner master suite offers Hudson River and city views, extensive storage, and a pristine en-suite bathroom with a deep soaking tub. The second and third bedrooms have open south views and spacious layouts as well, and the adjacent marble second bathroom includes a steam shower. This ornate prewar cooperative is ideally situated just off Riverside Park, in a double-wide building created by the combination of two adjacent turn-of-the-century mansions. The Cloisters offers elevator service, part-time doorman service and a superintendent, and the building is pet-friendly. This rare duplex penthouse offers an enchanting fusion of modern luxury and classic Upper West Side charm.