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640 S Mashta Dr, 
Key Biscayne, FL 33149

$19,500,000


5

Beds


5

Baths


3,620

Sq Ft


Single Family


Virtual Tour

Active

Listed by

Claudia Fontecilla

Dls International Realty

Last updated:

October 27, 2025, 09:57 AM

MLS#

A11896953

Source:

SEFMLS

About This Home

640 S Mashta Dr

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.

Home Facts

Single Family

5 Baths

5 Bedrooms

Built in 1968

Price Summary

19,500,000

$5,386 per Sq. Ft.

MLS #:

A11896953

Last Updated:

October 27, 2025, 09:57 AM


Rooms & Interior

Bedrooms

Total Bedrooms:

5

Bathrooms

Total Bathrooms:

5

Full Bathrooms:

5

Interior

Living Area:

3,620 Sq. Ft.


Structure

Structure

Architectural Style:

Detached, Two Story

Building Area:

4,990 Sq. Ft.

Year Built:

1968


Lot

Lot Size (Sq. Ft):

15,000


Finances & Disclosures

Finances

Price:

$19,500,000

Price per Sq. Ft:

$5,386 per Sq. Ft.

Source:SEFMLS
Information deemed reliable but not guaranteed. Information is provided, in part, by Greater Miami MLS. This information being provided is for consumer's personal, non-commercial use and may not be used for any other purpose other than to identify prospective properties consumers may be interested in purchasing.

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