Located in the prestigious and picturesque River House, this magnificent twelve-room duplex boasts shimmering East River views, remarkable scale, and pleasingly elegant proportions. Spanning approximately 5,300 square feet and with soaringly tall ceilings throughout, this expansive residence is further distinguished by its unique supplementary studio apartment with a dedicated private entrance onto East 53rd Street and connected to the duplex residence via an internal private elevator. This space includes a full Bath, Kitchenette and lots of closets. The residences central Gallery opens to the sun-flooded Living Room and Library, both with wood-burning fireplaces and sparkling East River views. The Living Room boasts perfect proportions, spans more than 35 in length, and is anchored by a deep, five-sided bay window. Adjacent, the Dining Room connects through elegant French doors. Beyond, a large Kitchen is supported by a proper Butlers Pantry, a Breakfast Room, a Staff Room and ensuite bathroom, as well as an additional large Bedroom and bath. A Powder Room and coat closet are conveniently accessible from the Gallery. Above, tranquil private quarters feature a delightful Primary Suite with sparkling views of the East River from the immensely large Bedroom and its adjoining Sitting Room, replete with a cozy corner fireplace. Both rooms open onto balconies overlooking the River, and the suite further incorporates very ample closets and two full baths. There are two additional Bedrooms, both with very ample closets and ensuite baths. All bedrooms benefit from glorious southern light and outlooks over the buildings beautiful courtyard gardens. River House is one of Manhattans finest and most discreet addresses. Designed by William L. Bottomly in 1931, this architecturally exquisite art deco building is notable for its elegantly gated entrance court and its inspired, light-filled lobby, which opens onto tiered gardens with views of the East River and beyond. Impeccable service includes two full-time doormen and a concierge, as well as a top resident manager. The sale also includes the use of one storage room. This immensely grand duplex is truly an oasis from the brisk pace of the city.