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
Price:
$16,800,000
MLS #:
A11990382
Status:
Active
Beds:
4
Baths:
4
Type:
Single Family
Subtype:
Single Family Residence
Subdivision:
MASHTA ISLAND
Neighborhood:
mashtaisland
Listed Date:
Apr 2, 2026
Finished Sq Ft:
3,620
Total Sq Ft:
4,990
Year Built:
1968
See this Listing
Schools
Elementary School:
Keybiscayne
Middle School:
Ponce De Leon
High School:
Coral Gables
Interior
Appliances
Dishwasher
Bathrooms
4 Full Bathrooms
Cooling
Central Air
Flooring
Other
Heating
Other
Interior Features
First Floor Entry, Entrance Foyer, Pantry, Split Bedroom, Vaulted Ceiling(s), Walk-In Closet(s), Garage Converted
Exterior
Architectural Style
Attached, Other
Attached Garage YN
1
Community Features
Public Road
Construction Materials
Concrete Block Construction
Covered Spaces
2
Direction Faces
East
Exterior Features
Other
Garage Spaces
2
Lot Features
Less Than 1/4 Acre Lot
Open Parking YN
1
Parking Features
Driveway, Guest
Roof
Barrel Roof
View
Bay, Garden
Waterfront Features
Ocean Access, Ocean Front
Financial
Tax Year
2025
Taxes
$155,651
Map
Community
- Address640 S Mashta Dr Key Biscayne FL
- SubdivisionMASHTA ISLAND
- CityKey Biscayne
- CountyMiami-Dade County
- Zip Code33149
Market Summary
Current real estate data for Single Family in Key Biscayne as of Apr 21, 2026
58
Single Family Listed
176
Avg DOM
2,146
Avg $ / SqFt
$8,980,724
Avg List Price
Property Summary
- Located in the MASHTA ISLAND subdivision, 640 S Mashta Dr Key Biscayne FL is a Single Family for sale in Key Biscayne, FL, 33149. It is listed for $16,800,000 and features 4 beds, 4 baths, and has approximately 3,620 square feet of living space, and was originally constructed in 1968. The current price per square foot is $4,641. The average price per square foot for Single Family listings in Key Biscayne is $2,146. The average listing price for Single Family in Key Biscayne is $8,980,724.
Similar Listings Nearby
640 S Mashta Dr
Key Biscayne, FL