Perfectly positioned in one of Park Avenue's most prestigious pre-war cooperatives, Residence 9C is a meticulously renovated seven-room home that seamlessly blends timeless architectural grandeur with the finest modern amenities. Accessed via a semi-private elevator landing, this exceptional residence offers an elegant lifestyle in one of the Upper East Side's most coveted white-glove buildings. A gracious entrance foyer introduces the home's remarkable scale, highlighted by soaring 11.5-foot ceilings, oversized windows, beautifully proportioned rooms, and impeccable craftsmanship throughout. Every detail of the renovation has been thoughtfully executed, preserving the home's classic pre-war character while elevating it for contemporary living. The sun-filled living and dining rooms are beautifully scaled for entertaining. The expansive living room is anchored by a working wood-burning fireplace, creating a warm and inviting atmosphere, while the formal dining room comfortably accommodates large gatherings. A sophisticated powder room just off the foyer completes the home's gracious entertaining spaces. At the heart of the residence is a spectacular Christopher Peacock eat-in chef's kitchen, masterfully expanded to incorporate the former staff room. Designed for both everyday living and effortless entertaining, the windowed kitchen features striking Calacatta Gold marble countertops, a Wolf gas range with custom hood, and a suite of premium appliances including Sub-Zero refrigerator and freezer columns, a beverage center, microwave, and a full-size washer and dryer. Custom cabinetry and generous pantry storage provide exceptional functionality without compromising elegance. Privately situated in its own wing, the bedroom quarters offer a tranquil retreat. The luxurious primary suite features a beautifully appointed, windowed Waterworks marble bathroom with refined metal detailing, a soaking tub, and plumbing in place for an additional vanity. Two generously sized secondary bedrooms share an equally elegant renovated bath, each finished with the same exceptional level of quality found throughout the home. Additional highlights include beautiful hardwood floors, brand-new windows, updated HVAC and plumbing systems, and a private storage unit that transfers with the apartment—providing every modern convenience while honoring the residence's historic character. Originally built in 1914 by Rouse & Goldstone, 850 Park Avenue is one of the Upper East Side's premier full-service cooperatives. Residents enjoy white-glove service along with an impressive collection of amenities, including a fitness center, laundry room, bike storage, basketball court, landscaped courtyard, and outdoor play area. The building is pet-friendly, permits financing of up to 30%, and has a 2.5% flip tax payable by the purchaser. Ideally situated between 76th and 77th Streets on one of Manhattan's most iconic avenues, Residence 9C offers the very best of Upper East Side living. Just moments from Central Park, residents enjoy immediate access to world-renowned museums, Madison Avenue's luxury boutiques, acclaimed restaurants, charming neighborhood cafés, and convenient transportation. This is a rare opportunity to own an impeccably renovated classic home in one of Park Avenue's most distinguished cooperative buildings.