Perfectly positioned on a level 0.49-acre lot in the heart of Sag Harbor Village, 11 Columbia Street offers a rare combination of immediate livability and expansive future potential. The current residence-a sun-drenched 4-bedroom, 2-bath ranch-features an open kitchen, hardwood floors, and a spacious layout that serves as a comfortable year-round home or a high-demand rental. While the existing home is move-in ready, the true value lies in the site's significant build-out potential. With nearly half an acre of prime Village land, there is ample room to transform this property into a world-class luxury compound. The lot easily accommodates a substantial new construction main house, a pool, and a detached guest house (ADU), allowing you to maximize the allowable Gross Floor Area (GFA) for the area. Whether you choose to enjoy the mid-century charm of the current home or embark on a custom development project, this property represents one of the best values in the Village today. Key Features: Well-Maintained Ranch: 1,660 SF of living space plus a 345 SF finished lower level. Massive Lot for the Village: 0.49 acres provides the footprint needed for a multi-structure estate. Prime Location: Situated in a quiet residential neighborhood just moments from Main Street's shops and dining and close to the water.