NEW PRICE! This stunning half-floor residence has the charm and sensibility of a prewar cooperative, with all of the modern conveniences of new construction. At over 3,700 square feet, this beautiful home features 4 bedrooms and a library, or 5th bedroom, and 4.5 bathrooms. An entry foyer leads to the spacious and well-proportioned entertaining space. The side-by-side living and dining room flow seamlessly into the library and large den off the kitchen, all facing tree-lined West End Avenue. The library can also be closed off and used as a 5th bedroom, with its en-suite bathroom. The custom Smallbone kitchen is equipped with an eat- in peninsula, custom cabinetry, double dishwashers and appliances from La Cornue, Miele, and Sub-Zero. The bedroom wing features 4 bedrooms, three bathrooms and very generous closets. The spacious primary bedroom features a large walk-in closet and the en-suite marble bathroom is furnished with double sinks, Waterworks fixtures, radiant heating, deep soaking tub and walk in shower. There are 3 additional bedrooms and 2 full baths in this wing as well. Additional features include hardwood flooring, oversized tilt and turn windows, central air conditioning, side-by-side washer/dryer, and smart home wiring by Savant technology. 535 West End Avenue is a full-service building in the heart of the Upper West Side. Amenities include a common courtyard, state of the art fitness center and locker rooms, recreation room with billiards and ping-pong, children's playroom, and a beautiful heated indoor swimming pool.