21 S Fulton Dr Unit #29, Montauk. This custom finished three bedroom, two and one half bath duplex townhouse is one of the highest quality condominiums in Montauk and is located in the highly desirable Stepping Stone private community. Tastefully renovated with transitional modern open floor plan, top quality finishes, and stylish designer furniture. The property is ideally located, includes a pool, has beautiful views of Montauk Lake from the deck and the horse farm across the front, and is scenically surrounded by nature preserves.