520 S Mashta Drive, Key Biscayne, FL 33149

$19,900,000
5
BD
4
BA
3,085
SqFt

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List Price
$19,900,000
Days on Market
6
MLS#
A12071221
Bedrooms
5
Full Bathrooms
4
Sq. Ft
3,085
Subtype
Single Family Residence
County
Miami-Dade
Subdivision
Mashta Island A Replat Of
Year Built
1961

Property Description

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.

Additional Information

Garage Spaces
2
Construction
Block
Cooling
Central Air
Equipment
Other
Flooring
Tile
Heating
Central
Roof
Barrel, Spanish Tile
Taxes
$201,741
View
Bay, Ocean
Private Pool
Yes
Amenities
Other
Waterfront
Bayfront, Ocean Access, Seawall
Stories
1
Acres
0.51
Price Per Sqft
$6,450
Elementary School
Key Biscayne K-8
Middle School
Ponce De Leon
High School
Coral Gables

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Listing courtesy of Coldwell Banker Realty. Contact:

All listings featuring the BMLS logo are provided by Beaches MLS Inc. Copyright 2026 Beaches MLS. This information is not verified for authenticity or accuracy and is not guaranteed. © 2026 Beaches Multiple Listing Service, Inc. All rights reserved.


Agent: Maureen Jauregui | Email: carter.jauregui@gmail.com