Available for the first time in over 30 years, this spectacular penthouse offers unparalleled Hudson River and Riverside Park views and wonderful outdoor space. Offering 4200 square feet of interior space and 1500 square feet of outdoor space, this grand duplex is perfect for entertaining both indoors and outdoors. Off of a semi-private landing, an entry hallway with two coat closets leads to a gallery that opens up to the grand entertaining space. The nearly 30 foot long living room boasts three, West facing giant picture windows providing gorgeous views of the River, the Park and the skyline beyond. The living room is open to the huge, nearly square dining room with South and East facing windows, which brings in wonderful light all day. The windowed, eat-in chef's kitchen features stainless steel countertops, a Liebherr refrigerator, and a side by side Miele washer/dryer. Across the hall is a walk-in pantry. This floor also boasts three spacious bedrooms as well as a staff room. The oversized corner bedroom features fantastic Western views of the River and open Northern views of Riverside Park and the George Washington Bridge. It also has a walk-in closet and en-suite windowed bathroom. The two other secondary bedrooms are also light filled and have en-suite bathrooms and generous storage space. Completing this floor is a staff room with powder room. A custom staircase leads up to a generous library with an attached office space. The whole room is sun flooded by skylights as well as an open North exposure looking out onto the terrace. The primary bedroom is nicely tucked away and features a huge walk-in closet and direct access to the Western, River front terrace. The gorgeous, windowed primary bathroom has a beautiful mosaic tiled floor, glass stall shower, separate bidet, and a view of the River. There are two additional bedrooms on this floor as well as an additional full bathroom. Outdoors is the enormous and wide wrap terrace with 50 feet facing West directly onto the River and 75 feet facing Northwest. The layout is perfect as-is, but the private quarters and the entertaining spaces could also be flipped so that the public areas are adjacent to the terraces. 54 Riverside is a full-service cooperative located at the corner of 78th Street and Riverside Drive with the entrance on 78th Street. Built in 1927, it has a wonderful staff including full time doormen and porters and a resident manager. There is storage and a bike room and pets are allowed. There is a flip tax in the amount of 2% paid by the shareholder. Please call for a private appointment.