$19,500,000
640 S Mashta Dr
Key Biscayne, FL, 33149
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:
$19,500,000
MLS #:
A11896953
Status:
Active
Beds:
5
Baths:
5
Type:
Single Family
Subtype:
Single Family Residence
Subdivision:
MASHTA ISLAND
Neighborhood:
mashtaisland
Listed Date:
Oct 15, 2025
Finished Sq Ft:
3,620
Total Sq Ft:
4,990
Year Built:
1968
Schools
Elementary School:
Keybiscayne
Middle School:
Ponce De Leon
High School:
Coral Gables
Interior
Appliances
Dishwasher, Dryer, Microwave, Washer
Bathrooms
5 Full Bathrooms
Cooling
Central Air
Flooring
Tile, Wood
Heating
Central
Exterior
Architectural Style
Detached, Two Story
Community Features
None
Construction Materials
Concrete Block Construction, CBS Construction
Parking Features
Circular Driveway, Covered, Driveway
Roof
Flat Tile
Financial
Tax Year
2024
Taxes
$81,859
Mortgage Calculator
Map
Current real estate data for Single Family in Key Biscayne as of Oct 22, 2025
51
Single Family Listed
191
Avg DOM
2,411
Avg $ / SqFt
$10,416,059
Avg List Price
Community
- Address640 S Mashta Dr Key Biscayne FL
- SubdivisionMASHTA ISLAND
- CityKey Biscayne
- CountyMiami-Dade County
- Zip Code33149
Similar Listings Nearby
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 $19,500,000 and features 5 beds, 5 baths, and has approximately 3,620 square feet of living space, and was originally constructed in 1968. The current price per square foot is $5,387. The average price per square foot for Single Family listings in Key Biscayne is $2,411. The average listing price for Single Family in Key Biscayne is $10,416,059.

640 S Mashta Dr
Key Biscayne, FL