640 S Mashta Drive, Key Biscayne, FL 33149
- Beds
- 4
- Baths
- 4
- Living Area
- 3,620 SF
- Year Built
- 1968
- $/SF
- $4641
- Type
- SingleFamilyResidence
- DOM
- 59
4 bed · 4 bath · 3,620 sqft · Built 1968
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
- SingleFamilyResidence
- Condition
- Resale
- Year built
- 1968
- Roof
- Barrel
- Subdivision
- MASHTA ISLAND
- Waterfront
- Yes
- Waterfront features
- OceanFront
- Private pool
- Yes
- Parcel number
- 2452050080320
- Annual tax
- $155,651
- County just value
- $9,910,420
Key Biscayne is a barrier-island enclave — restricted access, oceanfront SFH, and an inventory measured in tens, not hundreds. Premiums reflect the geography.
This listing fits several of our specialty verticals — explore similar properties.
Similar listings within 2 miles.
Listing data sourced from BeachesMLS / Trestle. All information herein is deemed reliable but is not guaranteed and should be independently verified. Information last updated 5/31/2026. Represented by Eleven Realty Partners, LLC d/b/a XI Realty · Equal Housing Opportunity.