Turn-key duplex with the charisma and comfort of a large townhouse, nestled in one of Riverside Drive's finest full service prewar buildings. This 6 Bedroom, 5 Bathroom is a picture of easy accessibility, including a fully self-sufficient guest suite, full-home central HVAC, and ample space to accommodate your entire household. Elevated a half-story above grade, surrounded by the 1906 building’s distinctive ‘moat’ setback, and with over 10-foot ceiling heights, the home’s main level feels like a pre-war brownstone’s grand parlor floor. The entrance foyer opens to stunning oval staircase, art-ready gallery, and 29-foot formal living room overlooking Riverside Park. French doors access a full guest suite, complete with a windowed butler’s pantry, private entrance foyer, bathroom, and spacious park-facing bedroom. A second bedroom suite wraps around the sculptural oval staircase, cleverly accessible through a ‘hidden’ door in custom the coffered woodwork. Ascending the staircase brings you to the comfortable living/dining room and chef’s kitchen, connected by an attractive quartz breakfast counter. The spacious kitchen includes a full suite of Wolf and Sub-Zero appliances, including dual under-counter freezers, and a 6-burner gas range. In addition to the first level’s two suites, four more bedrooms are sensibly arrayed upstairs. The primary suite sits at the floor's quiet east end, featuring a wall of closets and primary bathroom with dual sinks and a large shower. An adjoining room can function as its own bedroom, or create a seamless extension to the primary suite as nursery, dressing room, or caregiver’s space. A third east-facing bedroom includes en-suite bath and walk-in closet. The sixth bedroom faces a quiet windowed den, and sits adjacent to the home’s fifth full bathroom. This duplex was crafted over two thorough renovations, and has been continually updated and meticulously maintained. Custom inlays of Italian calacatta marble are artfully bookmatched into three dramatic mantlepieces, and also form precisely sculpted sills below every window. Hardwood floors run throughout, with quartersawn oak framed by an attractive walnut trim unifying the bedroom level. The custom staircase was thoughtfully designed with LED-lit treads and an elegantly sinuous hardwood banister. The full-home central air conditioning system includes separate mechanical rooms on each floor, providing the type of properly sized and engineered HVAC solution typically reserved for high-end townhouse restorations. Build at the turn of the century, The Clarendon is a full-service, twelve-story cooperative with full-time doormen, a live-in resident manager, fitness room, individual storage, laundry, and a bicycle room. It stands where West 86th Street ends at Riverside Park; a quiet, leafy corner, conveniently accessible to everything the Upper West Side has to offer.