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640 S Mashta Dr
Key Biscayne, FL 33149
$16,800,000
Active
38+
$16,800,000
Active
4
Bedrooms
4
Bathrooms
N/A
Half Baths
3,620 
Size Sq. Ft.
3
DOM
640 S Mashta Dr Key Biscayne, FL 33149
4 Beds, 4 Baths, Single Family Residence 3,620 Sq.Ft.

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

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Listing Summary
  • Address 640 S Mashta Dr
  • City Key Biscayne
  • County Miami-Dade
  • Zip 33149
  • Price $16,800,000 ($4,641 / SqFt)
  • Status Active
  • Subdivision Mashta Island
  • Pets Allowed
  • MLS® # A11990382
  • Property Type Residential
  • Property Sub TypeSingle Family Residence
  • Status Active
  • Square Feet 3,620
  • Year Built 1968
  • Waterfront YES
  • Maintenance Fees No Info Provided
  • Taxes $155,651
  • Tax Year 2025
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640 S Mashta Dr
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The data relating to real estate for sale on this web site comes in part from the participating Associations of the Miami Multiple Listing Service. The MLS data provided for the property above (A11990382) is provided courtesy of (DLS International Realty). The information being provided is 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. Information is deemed reliable but not guaranteed. Data last updated on 08-20-2026. IDX powered by Realty Net Media
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