Welcome to 18 Nassau Street, Massapequa, nestled in the highly sought-after Old Harbour Green community, known for its picturesque streets and serene, family-friendly atmosphere. This beautiful 4-bedroom, 2.5 updated bath Colonial stands out with its rare basement, providing bonus playroom or storage space. Beautiful Hardwood floors make up the first floor living space. A centrally located Kitchen allows for large parties and entertaining. The home features 2 charming wood-burning fireplaces, one in the living-room and the other in the family room with Built-in book cases. All 4 bedrooms are generous in size with the Primary bedroom en-suite and walk-in closet. The backyard is your personal oasis with an inground 16x36 liner pool w/waterfall, retractable awning and beautiful pavers perfect for enjoying warm summer days. Eco-conscious buyers will love the solar panels, making the home both energy-efficient and cost-effective. The spacious attached 2-car garage adds additional storage. Natural Gas 4Zn heating, 200 amp service, an in-ground sprinkler system and generator are additional upgrades to this home. It is located in a X-Zone where no flood insurance is required. Minutes to Birch Lane Elementary School and Green Harbour Beach Club where registration is available and required. Harbor Green offers an unparalleled South shore life-style, private community with easy access to private beaches, marina, shopping, dining, top-rated schools, and scenic walking paths and public parks. LIRR operates from Massapequa to Penn Station every 20 minutes with a short journey of 56 minutes. Make 18 Nassau Street, Old Harbour Green become your "Forever Home"