This masterpiece one-of-a-kind penthouse duplex with sweeping river panoramas is truly unparalleled! The breathtaking 4-5 bedroom trophy prewar home offers 4,000 square feet of the most luxurious interior living space and close to 4,000 square feet of dazzling outdoor space on 5 glamorous terraces, including an incredible private outdoor putting green! Single pane, sound proof windows afford the most ravishing river views throughout the entire residence! From an elegant private elevator landing, you enter an impressive foyer leading to an incomparable ballroom size living room with wood-burning fireplace and huge wrap terrace overlooking the Hudson River. The stunning dining room also faces the river and has a wood-burning fireplace, skylights, and fantastic wet bar for entertaining. A large, state-of-the-art, chef's kitchen offers beautiful cabinetry, granite countertops, and the finest appliances including a Sub Zero refrigerator and Viking stove. The breakfast room is perfect for informal family dining and leads out to a tremendous terrace, over 1,000 sf, with a wonderful outdoor grill and gracious seating. Also on the first floor are three large guest bedrooms, three full designer bathrooms including jacuzzis and steam showers, and a washer/dryer. Ascend the magnificent staircase to the most romantic master bedroom suite in New York with panoramic river views and wood-burning fireplace, flanked by two incredible terraces. The enormous marble master bathroom has a fantastic jacuzzi and the marble guest bath has a terrific steam shower. You will love the handsome mahogany wood-panelled library with wood-burning fireplace and wet bar, in addition to an exceptional media/family room, both are simply perfect for relaxing and entertaining. The entire home offers the finest furnishings throughout, both inside and out, and is fully-equipped with everything your heart desires! Central air-conditioning, Wi-Fi, built-in stereo system, huge custom closets, designer lighting, gorgeous hardwood floors and high ceilings are just a few of the many pleasures of living in this incomparable home. All in an exquisite Beaux Art prewar building with 24 hour doorman/elevatorman in a prime west side location next to Riverside Park. You will have to see it to believe it, as this rare mansion in the clouds will take your breath away!