An exceptional opportunity on coveted Millionaire's Row in Tavernier, 88835 Old Highway offers over 3 acres of oceanfront property paired with a rare additional acre featuring a protected boat basin--delivering a unique blend of privacy, usability, and future potential in the Upper Keys. Completed in 2022, the existing 3-bedroom, 3 bath residence spans approximately 1,500 square feet and is thoughtfully designed with impact windows and doors, hardwood flooring, a steel metal roof, and a well-appointed kitchen featuring Viking appliances. Outdoor living is enhanced by shell stone porch flooring, covered parking, and professionally designed landscaping with turf for low-maintenance coastal living. The property is comprised of three distinct parcels, including a buildable lot (Lot 2A), the current homesite (Lot 2), and a natural hammock parcel (Lot 3A) that serves as a permanent privacy buffer from the road, preserving the integrity and seclusion of the estate. A highly valuable feature of this offering is the inclusion & rare opportunity to create a custom waterfront compound tailored to your vision, while maintaining immediate livability. With direct access to a private boat basin and expansive acreage rarely found in the Keys, 88835 Old Highway represents a compelling combination of current enjoyment, future development flexibility, and long-term value in one of the area's most desirable waterfront corridors.