This glorious and sun-filled 11-into-10 room duplex is an exciting opportunity to own an architecturally beautiful and comfortable home at River House, a distinguished prewar cooperative on East 52nd Street and the East River. With very high ceilings and river views, the apartment is welcoming, sophisticated and perfect for entertaining. On the main level, the elevator opens into an elegant gallery. To the east is a grand drawing room with wood-burning fireplace and library, both with river views. To the west is an elegant, spacious and light dining room. There is a large kitchen, pantry and a breakfast room. There is also a powder room and bar. An elegant winding staircase leads upstairs to three large master bedrooms, two of which are river-facing, with large walk-in closets and en-suite baths. There is an additional staff room, a large room for an office, gym or fourth bedroom and a fourth full bath.