640 Mashta Drive, Key Biscayne, FL 33149

$16,800,000 — Active

Property Features

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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 Details

  • Listing ID: A11990382
  • Status: Active
  • Listing Date: 2026-04-02
  • Property Type: Single Family Residence
  • Subdivision: MASHTA ISLAND
  • County: Miami-Dade
  • MLS Area: 2520
  • Bedrooms: 4
  • Full Bathrooms: 4
  • Living Area Sq Ft: 3,620
  • Lot Dimensions: 15000
  • Year Built: 1968

Financial

  • List Price: $16,800,000
  • HOA Fee: None
  • Taxes: $155,651/yr

Features & Amenities

  • View: Garden, Bay
  • Pets Allowed: Yes, Dogs OK
  • Parking: Driveway, Garage Door Opener, Guest, Garage, Attached Garage, Attached
  • Cooling: Central Air
  • Heating: Other
  • Flooring: Other
  • Construction: Block
  • Roof: Barrel
  • Interior Features: Entrance Foyer, Pantry, Vaulted Ceiling(s), Walk-In Closet(s), Bedroom Layout - Split
  • Exterior Features: Other

Courtesy of DLS International Realty
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© 2026 Starfish Real Estate. Listings updated Nov 6, 2026 5:00 am. Listing data is derived from the Broker Reciprocity Program of the Realtor Association of Indian River County (RAIRC) and BeachsMLS. Properties listed by brokers other than Starfish Real Estate are identified with the applicable MLS logo and include the listing broker's name. Not all properties available through either MLS may be displayed. All MLS data is the copyrighted property of the respective MLS and its participants. Data is deemed reliable but is not guaranteed accurate and should be independently verified prior to entering into any transaction.