Welcome Home! This rare legal duplex in the heart of Aptos coveted Rio Del Mar neighborhood just moments from the beach. Located on a quiet cul-de-sac, 307 Treasure Island Drive offers the perfect blend of coastal lifestyle and investment potential. The property features two separate units totaling approximately 1,400 sq ft, including an upper 2-bedroom, 1-bath residence with vaulted ceilings, abundant natural light, and sliding glass doors that open to a private balcony ideal for enjoying ocean breezes. The lower 1-bedroom, 1-bath unit offers its own private entrance and access to a sunny side yard, providing flexibility for rental income, guests, or multi-generational living. An attached two-car garage provides parking and additional storage. Just minutes from Rio Del Mar State Beach, Seacliff State Beach, Aptos Village shops and restaurants, and miles of trails in Nisene Marks State Park, this property offers convenient access to Highway 1 while maintaining the relaxed charm of coastal Aptos living. Ideal for investors, owner-occupants seeking income potential, or those looking for a beach-close retreat.