Perfectly positioned for the U.S. Open, this exceptional Southampton estate offers a front-row seat to championship golf. The property sits directly overlooking the 15th hole of Southampton Golf Club and is less than a mile from the gates of Shinnecock Hills Golf Club, host of the 2026 U.S. Open. Its unmatched location places you within minutes of National Golf Links, Peconic Bay, Cold Spring Beach, and Southampton Village, ensuring effortless access not only to the tournament, but also to the very best of the Hamptons. Whether hosting players, sponsors, or distinguished guests, this compound provides a rare blend of prestige, convenience, and luxury at the heart of golf's biggest stage. Set on 0.7 acres+/-, the compound blends historic character with modern luxury. A brand-new main residence, crafted by Third Way Construction with landscape design by Jacob Antilety, is paired with the complete gut renovation of a 100-year-old farmhouse, creating approximately 9,000 SF+/- across the main home, farmhouse, and pool house. With 8 bedrooms, 10 full baths, and 3 half baths spanning all three structures, the estate easily accommodates large groups with comfort and privacy. The main residence showcases soaring ceilings, walls of glass, brand new furniture, and seamless indoor-outdoor flow. The lower level is dedicated to leisure, featuring a golf simulator, wet bar, generous recreation space, and a spa with steam room and infrared sauna. The farmhouse serves as the ultimate guest retreat, complete with four en-suite bedrooms. Outdoors, the lifestyle continues with expansive terraces, a spacious back patio featuring a wood-burning fireplace overlooking the golf course, a heated gunite pool with lap lane, and a dedicated pool house with a full bath. 166 Sebonac is a rare compound offering timeless elegance, sweeping golf course views, and the ultimate Hamptons lifestyle - the perfect setting for the U.S. Open, surrounded by championship golf at every turn.