
$19,900,000
Single Family ResidenceActive520 S Mashta Dr, Key Biscayne FL 33149
MLS #A12071221About This Property
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.
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Blue Mar Real Estate Group
About Key Biscayne
Key Biscayne is a barrier island community just a bridge ride from Brickell, offering an island lifestyle wrapped around Crandon Park, Cape Florida State Park, and the Crandon Golf Course. The village is known for its safety, top-rated schools, and walkable pace, with residents ranging from young families to international buyers seeking secondary residences. Limited inventory and tight geography keep prices premium relative to mainland Miami.
Property Details
Property Type
Single Family Residence
Year Built
1961
Living Area
3,085 sq ft
Lot Size
22,140 sq ft
Bedrooms
5
Bathrooms
4
Garage
2 Spaces
Pool
No
Waterfront
Yes
Cooling
Central Air
Heating
Central
Roof Type
Barrel Roof, Curved/S-Tile Roof
Flooring
Tile
Construction
Concrete Block Construction
Style
Attached, One Story
HOA Fee
None
Annual Taxes
$201,741 (2026)
Days on Market
5
MLS #
A12071221
Features & Amenities
Interior
Appliances
Community
Other
Nearby Schools
Assigned public schools pulled from Miami-Dade County Public Schools’s official attendance-boundary data. Verify current boundaries with MDCPS before buying — zones can change year to year.
School data source: Miami-Dade County Open Data Hub
Location
City
Key Biscayne
State
FL
ZIP Code
33149
County
Miami-Dade County
Listing provided by Maureen Jauregui at Coldwell Banker Realty. Data from Miami Association of REALTORS®. All information deemed reliable but not guaranteed. Listing #A12071221.