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4 Beds
4 Baths
3,620 sqft

$16,800,000

640 S Mashta Dr, Key Biscayne FL, 33149

Price per sqft$4,640.88
Built in1968
Property size3,620 sqft
Property typeResidential

Overview

Active

Listed Apr 2, 2026

Updated 4 weeks ago

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

$111,771/mo

Est. mortgage payment based on a $16,800,000 home price.

All estimates are provided by Luxury Presence for informational purposes only. Actual amounts may vary.

Additional information

MLS® ID
A11990382

Interior Features

Bedrooms
4
Bathrooms
4

Exterior Features

Lot Size
0.34 Acres

Other Property Details

Taxes
$155,651
Tax Frequency
Annually
Pets Allowed
Yes
Waterfront
Yes

Broker Reciprocity Courtesy of DLS International Realty

 

Data last updated:9/14/2026.

 

The multiple listing information is provided by FL - Miami Association of REALTORS® (RAMB) from a copyrighted compilation of listings. The compilation of listings and each individual are ©2026FL - Miami Association of REALTORS® (RAMB). All Rights Reserved.

 

The information provided is for consumer's 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.

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