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Homes for sale in Key Biscayne
Single Family Residence

520 S Mashta Dr

Key Biscayne, FL 33149
$19,900,000
Beds
5
Baths
4
Sq ft
3,085
Year built
1961
Price per sq ft
$6,451

Listing courtesy of Maureen Jauregui, Coldwell Banker Realty

About this home

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.

Details

Property

Type
Single Family Residence
Style
Attached, One Story
Building
WF/Pool/Ocean Access
Year built
1961
Lot size
22,140 sq ft
Building name
MASHTA ISLAND A REPLAT OF
Subdivision
MASHTA ISLAND A REPLAT OF
County
Miami-Dade County
Faces
East
View
Bay, Direct Ocean
Waterfront
Ocean Access, Seawall
Flood zone
AE

Interior

Appliances
Other Equipment/Appliances
Flooring
Tile
Cooling
Central Air
Heating
Central
Features
First Floor Entry, Split Bedroom, Family Room

Exterior and parking

Pool
In Ground
Parking
Driveway
Garage spaces
2
Construction
Concrete Block Construction
Roof
Barrel Roof, Curved/S-Tile Roof

Community and fees

Annual taxes
$201,741
Terms
All Cash, Conventional

Neighborhood

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The data relating to real estate for sale or lease on this website comes in part from the Internet Data Exchange (IDX) program of MIAMI REALTORS® MLS. Listings are provided by participating brokers.

Information is deemed reliable but is not guaranteed and should be independently verified. It is subject to change and is provided for consumers’ personal, non-commercial use only, to identify properties they may be interested in. Listing last updated August 26, 2026.