An unparalleled development opportunity in the heart of the Florida Keys. Spanning approximately 10 acres, this expansive bayfront property represents one of the largest and most versatile land offerings currently available in the Middle Keys. 69401 Overseas Highway consists of two new construction homes (4 bedrooms/4.5 bathrooms each), 8 additional building rights (7 waterfront lots, 1 dry lot), 16 deep water boat slips in a protected basin (6 with boat lifts), and a total of 10 acres of land conveyed with the sale. The property offers exceptional flexibility for a luxury compound, secluded waterfront community, or private family retreat. The 2 current homes on property sit on 5200SQFT each, featuring 4 bedrooms/4.5 bathrooms, with a total interior square footage of 3300SQFT. Each has their own private pool & spa, unobstructed bay views, garage, Thermador appliances & marble kitchen countertops, impact doors and windows & designed to embrace the island lifestyle. The estate balances seclusion with convenience--just minutes from Marathon Executive Airport for effortless fly-in, fly-out access. As well as seamless access to both the bay & ocean side waters via Long Key Bridge or Channel 5. The setting is defined by endless sunsets, abundant wildlife, and world-class boating & fishing just steps from your door. Whether envisioned as a multigenerational retreat, a private waterfront sanctuary, or a visionary redevelopment, this legacy property offers the space, flexibility, and natural beauty to bring a dream to life.