Opportunity truly knocks once with this extraordinary Seabrook Beach waterfront estate, perfectly situated at the very end of River Street. Set on well over two acres (1.87 acres to the low-water mark) along the river, this rare offering includes two homes with direct access to the Atlantic Ocean, just minutes away by boat. What makes this property truly one of a kind? Enjoy your own private beach, parking for 15+ vehicles, and spectacular 360-degree water views from nearly every window, including the guest home. The private deep-water dock accommodates a yacht up to 65 feet, with approximately 15 feet of water at low tide. The main residence offers approximately 3,900 square feet of living space, plus an additional 952-square-foot attic ready for future expansion, all serviced by a private elevator. Features include two kitchens, multiple bathrooms, and breathtaking water views from every level. The detached guest home, approximately 900 square feet, includes a two-car garage and is filled with charm—ideal for guests or extended stays. This is a rare opportunity to own a landmark waterfront property unlike anything else on the Seacoast. See for yourself—this is truly a once-in-a-lifetime offering.