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520 S Mashta Dr, 
Key Biscayne, FL 33149

$19,900,000


5

Beds


4

Baths


3,085

Sq Ft


Single Family


Virtual Tour

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Listed by

Maureen Jauregui

Emma Jauregui

305-361-5722

Last updated:

August 23, 2026, 10:04 AM

MLS#

A12071221

Source:

SEFMLS

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About This Home

520 S Mashta Dr

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.

Home Facts

Single Family

4 Baths

5 Bedrooms

Built in 1961

Subdivision & Development:

MASHTA ISLAND A REPLAT OF

Price Summary

19,900,000

$6,450 per Sq. Ft.

MLS #:

A12071221

Last Updated:

August 23, 2026, 10:04 AM


Rooms & Interior

Bedrooms

Total Bedrooms:

5

Bathrooms

Total Bathrooms:

4

Full Bathrooms:

4

Interior

Living Area:

3,085 Sq. Ft.


Structure

Structure

Architectural Style:

One Story

Building Area:

4,177 Sq. Ft.

Year Built:

1961


Lot

Lot Size (Sq. Ft):

22,140


Finances & Disclosures

Finances

Price:

$19,900,000

Price per Sq. Ft:

$6,450 per Sq. Ft.

520 S Mashta Dr
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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Contact an Agent

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Contact, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If a Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby's International Realty®). I acknowledge that I have read and agree to the terms of use and privacy notice.