Homes in Key Biscayne

520 S Mashta Dr

520 S Mashta Dr, Key Biscayne FL 33149

Presented by Christopher Johnson, Broker, Johnson Homes LLC

Price
$19,900,000
Bedrooms
5
Baths
4
Interior
3,085 sq ft
Taxes
$201,741 a year
Year built
1961
Water
Ocean Access, Seawall
MLS
A12071221
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520 S Mashta Dr, Key Biscayne

About the 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.

Christopher Johnson

Presented by

Christopher Johnson

Broker, Johnson Homes LLC · License #BK3248478

Licensed since 2012, with more than 700 transactions and over $250 million in sales. I'll give you a candid read on this home: what it costs to own, how it compares, and whether it is worth the price.

More about Christopher

Listing courtesy of Coldwell Banker Realty. The multiple listing information is provided by the MIAMI REALTORS® MLS from a copyrighted compilation of listings. The compilation of listings and each individual listing are © MIAMI REALTORS® MLS. All rights reserved. The information provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. All properties are subject to prior sale or withdrawal. All information provided is deemed reliable but is not guaranteed accurate, and should be independently verified. Data last updated October 10, 2026 at 12:09 PM ET.