640 S Mashta Dr, Key Biscayne, FL 33149

$16,800,000 · 4 beds, 4 baths, 3,620 square feet · Active

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

Listing courtesy of DLS International Realty, the listing brokerage, 305-459-3875. MLS number A11990382.

Listing data courtesy of MIAMI REALTORS® MLS. Updated Oct 20, 2026 2:55 AM ET. MLS disclaimers

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Miami MLS. Listings courtesy of MIAMI REALTORS® MLS (SEFMLS). The data relating to real estate for sale on this website comes in part from the Internet Data Exchange (IDX) program of MIAMI REALTORS® (Southeast Florida Multiple Listing Service, SEFMLS). Real estate listings held by brokerage firms other than Winslow Homes LLC are marked with the name of the listing brokerage. IDX information is provided exclusively 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. The data is deemed reliable but is not guaranteed accurate by the MLS, and all information should be independently verified. Based on information from the Southeast Florida Multiple Listing Service (SEFMLS) as of October 20, 2026 at 2:55 AM Eastern.

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