PRIME DEVELOPEMENT OPPORTUNITY ON MASHTA ISLAND ! Waterfront Paradise with Unobstructed Views of Biscayne Bay. Great opportunity to Build your Dream Estate on this 15,000 Square Feet Oceanfront Lot. Mashta Island is the most exclusive Island in Key Biscayne. Key Biscayne is one of the safest cities in Miami Dade, great schools and excellent for families. Close to Coral Gables, Downtown, Brickell and Miami Beach.