One-of-a-kind masterpiece mansion ($55,000,000), blending modern building techniques with true old-world elegance, fronting Hayground Cove in Water Mill South. Set on a generous four acres, with a regular-apportioned lot on the water, the grounds are magnificently-landscaped for maximum privacy, including 80-year-old trees. The main residence opens with a grand, double-hearth staircase in cast bronze, and silver & gold leaf, with early 19th-century, stained glass skylight. Fully-automated, the house comes complete with state-of-the-art security and Crestron entertainment systems, that can be controlled from anywhere in the world. No detail was spared, with over 120 exterior brackets, coffered ceilings in both library and living room, plus coffered cross beams in the living room. Grand master suite, 4 separate guest suites, 3 staff bedrooms, & 8 fireplaces with early 19th-century mantelpieces.