640 S Mashta Dr Key Biscayne FL 33149 MLS #A11990382
640 S Mashta Dr
Key Biscayne, FL, 33149
$16,800,000
4 Beds
4 Baths
3,620 SqFt
0 Acres
$16,800,000
640 S Mashta Dr
Key Biscayne, FL, 33149
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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

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
WaterfrontOceanfrontPoolMashta IslandMashtaislandMashta IslandKeybiscaynePonce De LeonCoral GablesOk To LeaseDogs Ok

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
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Map

Current real estate data for Single Family in Key Biscayne as of Jun 09, 2026
57
Single Family Listed
181
Avg DOM
2,532
Avg $ / SqFt
$13,742,053
Avg List Price

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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 $2,532. The average listing price for Single Family in Key Biscayne is $13,742,053.
640 S Mashta Dr
Key Biscayne, FL