840 Park Ave

An early-20th-century limestone cooperative on Park Avenue, this distinguished prewar building rises 12–13 stories and contains a very small collection of large residences (primarily three-bedroom and multi-room layouts). Completed in the 1910s by architects George and Edward Blum, the structure preserves traditional details: high ceilings, ornate moldings, carved wood doors, and numerous original French floor-to-ceiling windows with Juliet balconies. Units frequently include formal dining rooms, wood-burning fireplaces, paneled libraries, separate staff or office rooms, and generously scaled eat-in kitchens updated with modern appliances. Common features emphasize full-service living: a 24-hour doorman, attentive porters, resident manager, transferable private storage, and a building roof deck. The co-op’s policies are owner-friendly for city standards — pets and pieds-à-terre are permitted, a modest flip tax applies, and financing rules allow partial mortgages. Apartments offer practical conveniences such as central air conditioning and in-unit washer/dryers in many homes. Located on the Upper East Side near 76th Street, the building fronts Park Avenue’s landscaped medians and sits within a classic, residential neighborhood of museums, shops, and transit, supporting a lifestyle oriented toward formal entertaining and a quiet, service-rich urban residence.