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Key Biscayne · Miami-Dade County

640 S Mashta Dr, Key Biscayne FL 33149

Key Biscayne, FL 33149 · MLS #A11990382

$16,800,000

For sale
4 bedrooms4 bathrooms3,620 sq ft

Listing courtesy of DLS International Realty

Listing agent: Brigitte De Langeron · 305-459-3875

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

Property type
Single Family Residence
Year built
1968
Lot size
15,000 sq ft
Waterfront
Yes
Pool
Yes
New construction
No
View all 38 photos
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Listing updated 9/19/2026, 10:33:34 AM Eastern. Feed checked 9/25/2026, 4:41:26 PM Eastern.

The data relating to real estate for sale on this website comes in part from the Internet Data Exchange (IDX) program of the Southeast Florida Multiple Listing Service (SEFMLS). Properties are listed by participating brokerages. Information is deemed reliable but not guaranteed. Information is provided for personal, non-commercial use to identify properties you may be interested in purchasing. All listings are subject to change and prior sale.