485 W Matheson Dr, Key Biscayne FL 33149

485 W Matheson Dr, Key Biscayne FL 33149 is an iconic residential, single-family estate in the TROPICAL ISLE HOMES RESUB subdivision of Miami-Dade County. Built in 1981 and offered unfurnished, this attached, multi-level property sits on approximately 103,775 sq ft (about 2.38 acres) with roughly 862' of direct Biscayne Bay frontage, ocean access and an extraordinary private marina and former presidential helipad. The owner describes more than 13,000 sq ft across three levels, while public records list a living area of 11,528 sq ft; interior highlights include soaring 24'+ ceilings, marble floors, walls of glass, an original glass elevator, built-in features, walk-in closets, multiple storage and utility rooms, a family room, split bedrooms and an entrance foyer.
The home offers 5 bedrooms plus a gym that can be converted to a sixth bedroom, 7+2 baths, and resort-style grounds with a piano-shaped saltwater pool, cabana bath, lush tropical landscaping and expansive lawns with integrated lighting. Views are sweeping—direct ocean, bay and pool vistas—and frontage is both oceanfront and bay with ocean access. The private marina can accommodate large yachts (dockage up to 200') and includes over 34,000 sq ft of submerged land.
Practical features include central air and electric cooling, central electric heating, a 2-car garage, circular driveway parking, utility room/laundry with washer and dryer, and appliances such as dishwasher, disposal, gas range, refrigerator and electric water heater. Exterior elements include lighting and open balconies; safety is supported by smoke detectors. Pets are allowed, community features are noted as other, and the property is offered by the TROPICAL ISLE HOMES RESUB building name—an estate that blends presidential and cinematic history with unmatched South Florida waterfront scale.