On the market for the very first time, this custom built estate with pool, pool house, and tennis sits on 4.5 acres overlooking over 100 acres of open land, polo fields and horse stables in Water Mill. Designed to take advantage of those panoramic views and the bucolic setting, the owners commissioned a prominent Hampton's builder to create this one-of-a-kind home of grand proportions and top-of-the-line amenities. Highlights from the first and second floor, consisting of approx. 6,500+/- square feet, include the grand foyer, great room with fireplace, living room with fireplace, formal dining room, gourmet marble kitchen with Ciuffo Cabinetry, screened-in porch, 2-car garage, laundry, wet bar, and 5 bedrooms, including a first floor junior master suite, and the luxurious second floor master suite with a large sitting room, fireplace, private balcony and outdoor shower. The finished lower level boasts an additional 3,400+/- square feet with a home theater, wine cellar, recreational room, gym, steam shower, 1.5 baths and bonus rooms. Outdoors, the rolling lawn and beautiful landscaping surrounds the all-weather tennis court, bluestone patio, putting green, heated gunite pool with spa, and the 2,200+/- square foot pool house. This rare and extraordinary setting in the Hamptons will not last long. Note: the 4.5 acres consists of a 2.1 acre residential lot and a 2.4 acre agricultural reserve.