This 51-acre Gold Coast estate dubbed Rynwood that’s home to a breathtaking Cotswold-style masterpiece of a mansion ranking among the top 100 largest homes in the nation is listed for sale at 1111 Cedar Swamp Rd. in the Village of Old Brookville.

Built in 1927, this 15-bedroom limestone estate house has nine bathrooms, three half bathrooms, and 40,000 square feet of living space. It was designed by esteemed architect Roger Harrington Bullard for English businessman Samuel Agar Salvage, who was president of The Viscose Company, a since-shuttered manufacturer of synthetic fabrics such as rayon. He was sometimes called the father of the rayon industry in the United States. 

Rynwood is tied with Coe Hall in Upper Brookville, The Braes in Glen Cove, Mills Mansion in upstate New York, and an unnamed Los Angeles mansion for 94th place in a list of the 100 largest homes in America in order of square footage. The property has more square footage than Roosevelt Field Mall.

The house boasts exquisite leaded glass windows, stone archways, gleaming English oak paneling, wide plank peg board floors and wood-beamed ceilings that add warmth and character to the interior. It features an eat-in kitchen, formal dining room, billiard room, play room, vaulted two-story library, office in the finished attic, and a fully finished basement complete with a 6,000-bottle wine cellar.

The house comes equipped with central air conditioning and 17 fireplaces. Outside it has in-ground sprinklers, a porch, patio, tennis court, six-car attached garage, five-bar maintenance garage, Vermont slate roof, formal gardens, a greenhouse, gate house, and a two-bedroom cottage. 

The house is located near the Cedar Brook Golf & Tennis Club, Brookville Country Club and other parks. It is also near the Glen Head Long Island Rail Road station and a short drive from downtown Roslyn and Glen Cove. It’s located in the North Shore School District.

The asking price is $23,000,000, not including the $154,276 in annual property taxes.

The real estate agent listed for this property is Debra Quinn Petkanas of Daniel Gale Real Estate, who can be reached at 516-674-2000.

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