520 S Mashta Dr Key Biscayne FL 33149 MLS #A12071221

520 S Mashta Dr
Key Biscayne, FL, 33149
$19,900,000
5 Beds
4 Baths
3,085 SqFt
0 Acres
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Seize a rare opportunity to create a landmark waterfront estate on one of the largest residential lots in Key Biscayne’s exclusive Mashta Island enclave. Spanning an extraordinary 22,140 square feet, this exceptional property offers 138 feet of pristine water frontage and sweeping open water views, providing an unparalleled setting for a world class residence.
Plans by renowned architect, Pablo Corazzini of Vitalini Corazzini Architects, are available to the buyer, offering a thoughtfully conceived vision that takes full advantage of the property’s remarkable scale, premier waterfront setting, and spectacular sunsets. The proposed design creates an extraordinary canvas for sophisticated indoor-outdoor living and entertaining, should the buyer choose to pursue the concept.
With its exceptional lot size, expansive water frontage, and coveted Mashta Island address, this is a truly irreplaceable opportunity to create a legacy estate in one of South Florida’s most prestigious waterfront communities.

Property Details

Price:
$19,900,000
MLS #:
A12071221
Status:
Active
Beds:
5
Baths:
4
Address:
520 S Mashta Dr
Type:
Single Family
Subtype:
Single Family Residence
Subdivision:
MASHTA ISLAND A REPLAT OF
Neighborhood:
mashtaislandareplatof
City:
Key Biscayne
Listed Date:
Aug 12, 2026
State:
FL
Finished Sq Ft:
3,085
Total Sq Ft:
4,177
ZIP:
33149
Year Built:
1961
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Schools

Elementary School:
Keybiscayne
Middle School:
Ponce De Leon
High School:
Coral Gables

Interior

Appliances
Other Equipment/ Appliances
Bathrooms
4 Full Bathrooms
Cooling
Central Air
Flooring
Tile
Heating
Central

Exterior

Architectural Style
Attached, One Story
Community Features
Other Subdivision – See Remarks
Construction Materials
Concrete Block Construction
Parking Features
Driveway
Roof
Barrel Roof, Curved/ S- Tile Roof

Financial

Tax Year
2026
Taxes
$201,741

Map

Community

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