850 Park Ave

Built in 1914 and rising twelve stories, this white‑glove prewar cooperative on Park Avenue contains a small collection of large, traditionally proportioned residences—primarily three- and four-bedroom layouts and classic multi-room maisonettes and duplexes. The building’s architecture and interior detailing reflect early 20th-century craftsmanship: high ceilings (around 10 feet), wide galleries, herringbone and hardwood floors, original moldings, decorative plaster ceilings and working wood-burning fireplaces in many homes. Units frequently include formal dining rooms, libraries or dens, large eat-in chef’s kitchens with butler’s pantries, substantial walk-in closets, and separate staff/maid rooms that are often repurposed as bedrooms or offices. Shared offerings emphasize full-service living: a 24-hour doorman, live‑in superintendent, fitness room, private storage bins, bike storage, central laundry facilities and an outdoor half basketball court set within a courtyard/play area. The co-op operates with typical Upper East Side policies—pet friendly, pied-à-terre allowed with board approval, 30% financing cap and a flip tax—while periodic assessments for capital projects have been used for facade and mechanical upgrades. Located between 76th and 77th Streets, the building sits two blocks from Central Park and adjacent to museum and cultural corridors, supporting a lifestyle oriented to museums, upscale retail, restaurants and convenient subway access.