$16,800,000
4 bd · 4 ba · 3,620 sq ft · Single Family Residence
640 S Mashta Dr, Key Biscayne FL 33149
For Sale · Active listing
Est. payment $93,056/mo · Mortgage calculator
Listed by DLS International Realty / Brigitte De Langeron
Contact: 305-244-7493 (listing contact).
Shown through Slice Realty. Requests from this page reach Slice Realty / Propiedad Futura, not the listing agent.
About this home
Welcome to your own slice of paradise! Enjoy breathtaking sunsets from your private dock on this waterfront property boasting 100 feet of direct Biscayne Bay frontage. Ideally located on Mashta Island. Set on a 15,000 SF lot, the home features 5 beds, 5 baths, including 2 bayfront primary suites with stunning views, impact windows and doors throughout. The open-concept layout flows seamlessly from the living and dining areas to the modern kitchen and out to the pool and entertainment patio, with floor-to-ceiling glass doors that open to blend indoor and outdoor living. Tranquil guest suite upstairs offering privacy and views. It also features an oversized 2-car garage, covered parking, and a spacious driveway for guests. Perfect to move in, renovate, or build your dream waterfront estate
Facts
- MLS #
- A11990382
- Subdivision
- MASHTA ISLAND
- Property type
- Residential
- Property subtype
- Single Family Residence
- Sq. ft.
- 3,620
- Price per sq. ft.
- $4,641 / sq ft
- Year built
- 1968
- Days on market
- 170
- County
- Miami-Dade County
- Date listed
- Apr 2, 2026
- Last updated
- Sep 19, 2026
Financial considerations
- Taxes
- $155,651 (2025)
Exterior features
- Waterfront
- Yes
- View
- Bay, Garden
- Construction
- Concrete Block Construction
- Roof
- Barrel Roof
- Additional features
- Other
Interior features
- Heating
- Other
- Cooling
- Central Air
- Appliances
- Dishwasher
- Additional features
- First Floor Entry, Entrance Foyer, Pantry, Split Bedroom, Vaulted Ceiling(s), Walk-In Closet(s), Garage Converted
Additional features
- Pets allowed
- Dogs OK
- Community
- Public Road
Mortgage calculator
Includes principal and interest, taxes and insurance.
Rate: Freddie Mac 30-year average (2026-10-15). Estimate only.
Local context (our analysis)
Area stats are available for our covered neighborhoods. See neighborhoods.
Source: Southeast Florida MLS (SEFMLS). Last updated Sep 19, 2026, 10:33 AM ET
Listing data is deemed reliable but is not guaranteed accurate by the MLS. Information is provided for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.