Exceptional opportunity to build a custom waterfront estate with 240 ft of waterfrontage in the prestigious, guard-gated Keystone Point. This expansive corner lot, located on a quiet cul-de-sac, is the largest vacant waterfront lot currently available and offers unmatched privacy and open-water proximity. Property features direct ocean access with one fixed bridge (appx. 13 ft clearance) and ample space for future dockage, providing convenient boat access to Biscayne Bay & Haulover Inlet. Architectural plans by SDH Studio are available for a striking 6,264 SF modern residence with 6 bedrooms plus a study, den, and 6.5 baths, designed for luxury waterfront living and seamless indoor-outdoor flow. Ideally located near Bal Harbour, top A-rated schools, beaches, shopping, dining, Miami Beach, Downtown Miami, and MIA & FLL airports. A rare opportunity to secure a ready-to-build Keystone Islands waterfront lot and create a custom modern estate.