For saleActiveListed Apr 2, 2026 · 202 days
$16,800,000

640 S Mashta Dr, Key Biscayne, FL 33149

4 beds4 baths3,620 sq ft$4,641 per sq ftBuilt 1968

As of , this 4 bedroom, 4 bath house is for sale at $16,800,000 ($4,641 per sq ft). It was listed on .

MLS data updated .

Key facts

Type
House
Year built
1968
Property tax
$155,651 (2025)
Parking
2 garage spaces
View
Bay, Garden
Waterfront
Yes
Pets
Pets allowed
Cooling
Central Air
Heating
Other
MLS number
A11990382

Listing information

Listing courtesy of DLS International Realty, 305-459-3875, dls.realtykb@gmail.com

Listing agent: Brigitte De Langeron, brigitte@miamiwaterfront.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

Welcome to your own slice of paradise! Enjoy breathtaking sunsets from your private dock on this waterfront property boasting 100 feet of direct Biscayne Bay frontage. Ideally located on Mashta Island. Set on a 15,000 SF lot, the home features 5 beds, 5 baths, including 2 bayfront primary suites with stunning views, impact windows and doors throughout. The open-concept layout flows seamlessly from the living and dining areas to the modern kitchen and out to the pool and entertainment patio, with floor-to-ceiling glass doors that open to blend indoor and outdoor living. Tranquil guest suite upstairs offering privacy and views. It also features an oversized 2-car garage, covered parking, and a spacious driveway for guests. Perfect to move in, renovate, or build your dream waterfront estate

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
202
Original list price
$16,800,000
Price changes
0
DateEventPrice
Listed$16,800,000

From the MLS. RealVista does not show sold prices.

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