There are few opportunities remaining in East Hampton where nearly 3.5 acres of waterfront, two separately deeded parcels, and nearly 300 feet of shoreline converge to create a true legacy estate. Privately positioned along coveted Three Mile Harbor Drive in the Northwest Woods, this exceptional compound offers a rare combination of scale, privacy, flexibility, and protected waterfrontage that would be nearly impossible to recreate today. Thoughtfully reimagined for modern waterfront living, the 4,575 +/- SF main residence is designed to celebrate its extraordinary setting. Walls of glass frame sweeping views across Three Mile Harbor and Gardiner's Bay, while refined interiors flow effortlessly through expansive entertaining spaces, a dramatic double-height great room, and a beautifully appointed chef's kitchen. Four ensuite bedrooms include a gracious primary suite with a private waterfront balcony and panoramic views. A finished lower level with flexible living spaces opens directly to landscaped grounds and a gentle path leading to the sandy shoreline, where kayaks and paddleboards launch directly into the harbor. Outdoor living is equally compelling, with expansive waterside terraces, covered dining areas, a heated pool with custom waterfall, and a pool house-all designed to embrace the estate's remarkable setting. A second, separately deeded parcel elevates this offering into a true legacy compound. The existing guest cottage provides immediate accommodations while preserving the opportunity to create a substantially larger residence with the potential for its own pool, an increasingly rare level of flexibility in East Hampton. Minutes from both East Hampton and Sag Harbor Villages, yet surrounded by protected shoreline and some of the Hamptons' most tranquil waters, the property offers complete privacy without compromise. Defined by its exceptional landholding, waterfront setting, and future potential, this is one of East Hampton's rarest compound opportunities, designed to be enjoyed today and held for generations.