3690 Expressway Drive South in Islandia presents a rare built-to-suit new construction professional building in one of the most desirable and centrally located areas on Long Island. The property consists of approximately 7,000 total square feet across three levels, including a 2,500 sq ft ground floor, 2,000 sq ft second floor, and a 2,500 sq ft full basement for storage, offering flexible space suitable for a variety of professional or office uses. The building will feature elevator access to all floors, modern construction, and 17 on-site parking spaces, providing convenience for staff and visitors. Ideally positioned on the South Service Road of Exit 58 off the Long Island Expressway, the property offers exceptional visibility and accessibility, making it an outstanding opportunity for businesses seeking a highly accessible, centrally located Long Island address.