Perfectly positioned on a pristine, park-like 1.35-acre cul-de-sac parcel, this beautifully maintained Water Mill traditional offers an incredible blend of immediate luxury and effortless future upside. Boasting a rare, highly coveted 4-bedroom Board of Health-approved septic system already in place, this turn-key 3-bedroom, 2.5-bath shingle-style residence eliminates the multi-month regulatory headaches of Hamptons expansion. Buyers can easily convert existing space, build a stunning new addition, or utilize the massive, full unfinished basement to seamlessly create a legal 4th bedroom suite. The light-filled, 3,170 sq. ft. interior flows seamlessly from the welcoming entry to the expansive living spaces, ideal for elegant entertaining. Structural and mechanical integrity take center stage with extensive recent modernizations, including a brand-new furnace, upgraded dual-zone A/C systems, an Aprilaire commercial dehumidifier, and upgraded insulation. The exterior is equally refined, featuring full-length covered porches, newly waterproofed masonry, and low-maintenance Versatex PVC trim. Outside, a true resort lifestyle awaits. A sprawling bluestone patio surrounds the heated, saltwater gunite pool, all framed by mature, professional landscaping that ensures total privacy. This is a rare, mechanically flawless asset offering unbeatable value and immediate equity growth potential in a premier Water Mill location.