Welcome to this spacious convertible three-bedroom duplex on one of the Upper East Side's most coveted blocks. This charming pre-war home is rich in character, featuring exposed brick, a wood-burning fireplace, nearly ten-foot ceilings, custom built-ins, and beautiful hardwood floors throughout. Currently configured as a two-bedroom, two-bath residence with a flexible third space, the layout offers exceptional versatility. Whether used as an additional bedroom, den, dining room, or second living area, the home easily adapts to your needs. The primary bedroom faces south and enjoys abundant natural light throughout the day. Generously proportioned, it comfortably accommodates a king-sized bed and features both a large closet and built-in storage. Downstairs, the second bedroom is equally spacious, with room for a king-sized bed, a closet, and the added convenience of in-unit laundry. The washer and dryer are full-sized, brand new, side-by-side, and vent out. Both bathrooms are well-maintained and outfitted with brand new Toto toilets and excellent storage. This is a well-run, self-managed cooperative with no underlying mortgage and attractive maintenance for the neighborhood. The building's exterior has been meticulously maintained, enhancing its curb appeal along this picturesque block. Please note: no pets allowed. East 78th Street is widely regarded as one of the Upper East Side's best blocks, offering a perfect balance of charm and convenience. Just moments from your doorstep are beloved neighborhood staples like Orwasher's, the century-old artisan bakery known for its exceptional sourdough as well as Agata & Valentina. A wide array of restaurants, cafes, and boutiques are all nearby. Transportation is seamless with easy access to the Q train on Second Avenue on both 72nd and 86th Streets; the six train at 77th Street and Lexington Avenue; and the four/five/six at 86th Street. Schedule your showing today!