Introducing the Maisonette at 810 Fifth Avenue (with its own private address at 811 Fifth Avenue), an exceptionally rare duplex residence in one of Manhattan's most distinguished prewar cooperatives. Designed by legendary architect J.E.R. Carpenter, this grand home seamlessly combines the scale and elegance of a Fifth Avenue mansion with the privacy, security, and white-glove service of one of New York's most prestigious addresses. Spanning approximately 5,600+ square feet, the residence offers five bedrooms, six full bathrooms, and one powder room. Exposures to the north, south, east, and west fill the home with natural light throughout the day, highlighting verdant Central Park views. A gracious entry gallery welcomes you into the entertaining level, where beautifully scaled public rooms create an exceptional setting for both intimate gatherings and grand entertaining. The elegant library, formal dining room, and expansive salon each feature classic proportions and timeless architectural character, each with a wood-burning fireplace. The oversized eat-in kitchen is complemented by a charming breakfast room, wine storage, and extensive workspace, creating a functional yet sophisticated heart of the home. The expansive primary suite offers remarkable scale, a wood-burning fireplace, generous closet space, and an oversized en-suite bath. Four additional bedrooms, each well-proportioned and privately situated, are accompanied by multiple full baths, providing exceptional flexibility for family, guests, or staff. Additional highlights include a music room, dedicated laundry room, service entrance, abundant storage, and thoughtful separation between entertaining and private living spaces. Built in 1926 in the Renaissance Palazzo style, 810 Fifth Avenue remains one of Fifth Avenue's most coveted cooperative buildings. Originally conceived by J.E.R. Carpenter as grand full-floor residences, the building has long attracted some of New York's most notable residents, including Nelson Rockefeller and William Randolph Hearst. Residents enjoy unparalleled privacy, exceptional white-glove service, and an iconic location directly across from Central Park, moments from Madison Avenue's luxury boutiques, world-renowned museums, and the city's finest restaurants. A property of this scale, pedigree, and rarity is seldom available. The Maisonette at 810 Fifth Avenue offers an extraordinary opportunity to own one of Fifth Avenue's most distinctive residences.