Homes for sale in Key Biscayne
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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.
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.