For saleActiveListed Aug 12, 2026 · 70 days
$19,900,000

520 S Mashta Dr, Key Biscayne, FL 33149

5 beds4 baths3,085 sq ft$6,451 per sq ftBuilt 1961

As of , this 5 bedroom, 4 bath house is for sale at $19,900,000 ($6,451 per sq ft). It was listed on .

MLS data updated .

Key facts

Type
House
Year built
1961
Property tax
$201,741 (2026)
Parking
2 garage spaces
View
Bay, Ocean
Waterfront
Yes
Cooling
Central Air
Heating
Central
MLS number
A12071221

Listing information

Listing courtesy of Coldwell Banker Realty, 305-361-5722, michaelj.suarez@cbrealty.com

Listing agent: Maureen Jauregui, carter.jauregui@gmail.com

BeachesMLS. 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.

MIAMI MLS. Listing data from MIAMI MLS (South East Florida Regional MLS). Information is deemed reliable but not guaranteed.

Listing information is provided for consumers' personal, non-commercial use. It may not be used for any purpose other than to identify homes consumers may want to buy or rent.

Listing last changed .

From the listing

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 text above is the listing description from the MLS, as written by the listing agent.

The Key Biscayne market

As of , the median asking price in Key Biscayne is $2,235,000, or $1,141 per sq ft, across 147 listings for sale. The median listing for sale there has been on the market for 110 days.

Price and status history

Listing date
Days on market
70
Original list price
$19,900,000
Price changes
0
DateEventPrice
Listed$19,900,000

From the MLS. RealVista does not show sold prices.

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