Pinebourne Farms, a 22.13-acre equestrian estate in Muttontown, is on the market for $9.988 million. Its brick and slate roofed mansion was designed in 1934 by John Washington Bradley Delehanty, the architect of many stately Long Island houses and designer of the interfaith chapel on the LIU Post campus.
The 15,000-square-foot manor home has nine bedrooms, eight bathrooms and two half-bathrooms. A floor-to-ceiling stone fireplace is the focal point of the great room -- there are six fireplaces in total -- and a balcony above holds the library with original built-ins. There is a formal dining room, living room, eat-in gourmet kitchen, elevator and attached conservatory with a heated indoor pool.
This working farm also includes a 12-stall stable, hay barn, four paddocks, quarter-mile training track, three-bedroom guesthouse, two-bedroom cottage, outdoor in-ground pool with cabana and attached three-car garage.
The listing agent is Maria Siringo of Shawn Elliott Luxury Homes & Estates.