At the end of prestigious Sunrise Lane, where land meets open water on 3 sides, 3750 Sunrise Lane stands as one of the most extraordinary waterfront offerings in Key West. Properties of this scale and setting rarely exist, and almost never come to market. Originally built in the 1950s and extensively rebuilt in 1999, this legacy estate sits on a 28,500sf peninsula, offering a rare scale, privacy, and waterfront presence that is nearly impossible to replicate. The 5,378sf residence blends timeless architecture with expansive indoor and outdoor living. The main level features gracious living spaces with heart pine floors, French doors, and light-filled rooms opening to wide terraces and tranquil water views. The home offers 5 bedrooms and 4.5 baths, including 3 first-floor bedrooms and a spacious primary suite designed for comfort and privacy. Upstairs, 2 guest bedrooms open to a covered balcony and rare widow's walk with panoramic views of the Atlantic, Gulf, and surrounding protected lands. At the heart of the home is an expansive family-style kitchen with a large breakfast room, bar seating, desk area, and rich wood cabinetry. A handsome den with a built-in wet bar creates a warm gathering space, while a studio/flex room offers versatility as an office, art studio, fitness room, or guest overflow. The grounds are equally remarkable, featuring mature tropical landscaping, a large swimming pool, and over 3,200sf of brick patios. Nearly 500 linear feet of seawall provide exceptional dockage with a concrete dock and 2 boat lifts offering immediate deep-water access to both the Atlantic and Gulf. An oversized finished 828sf garage with 4 garage doors adds rare flexibility and functionality. This legacy estate awaits restoration and the vision of its next owner. Its setting, structure, and scale create a once-in-a-generation opportunity to reimagine one of Key West's most significant waterfront properties.