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Key Biscayne/520 S Mashta Drive

$19,900,000
520 S Mashta Drive, Key Biscayne, FL 33149
Key Biscayne, FL 33149 · Bayfront,Ocean Access,Seawall
5
Beds
4
Baths
3,085
Sq Ft
$6,451
/ Sq Ft

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.

The facts

Price
$19,900,000
Price / Sq Ft
$6,451
Bedrooms
5
Bathrooms
4
Interior
3,085 sq ft
Type
SingleFamilyResidence
Year Built
1961
Stories
1
Lot Size
0.51 acres
Pool
Yes
Garage
2 spaces
Flooring
Tile
Waterfront
Bayfront,Ocean Access,Seawall
Annual Tax
$201,741
Days on Market
6
MLS #
A12071221

Amenities

  • Other
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Listing courtesy of Coldwell Banker Realty · carter.jauregui@gmail.com. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright ©2026 BeachesMLS, Inc.