Opportunity truly knocks once with this extraordinary Seabrook Beach waterfront estate, perfectly positioned at the very end of River Street. Set on over two private acres along the river (1.87 acres to the low-water mark), this rare offering includes two homes with direct access to the Atlantic Ocean just minutes away by boat. Enjoy your own private beach, parking for 15+ vehicles, and breathtaking 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 sq ft of living space, plus a 952 sq ft attic ready for expansion, serviced by a private elevator and featuring two kitchens and multiple baths. A charming detached guest home with a two-car garage adds approximately 900 sq ft of living space—perfect for guests or extended stays. A truly rare Seacoast waterfront estate unlike anything else.