520 S Mashta Drive, Key Biscayne, FL

$19,900,000

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5

Beds

4

Baths

3,085

Square feet

0.51

Acres

About 520 S Mashta Drive

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.

Single Family home for sale in Key Biscayne, FL at 520 S Mashta Drive. This 5 bedroom Single Family home is priced at $6,451/sqft

Features of 520 S Mashta Drive

MLS® # A12071221
Price $19,900,000
Bedrooms 5
Bathrooms 4.00
Full Baths 4
Square Footage 3,085
Acres 0.51
Year Built 1961
Type Single Family
Sub-Type Single Family Homes
Status Active

Community Information: Key Biscayne

Address 520 S Mashta Drive
Area 2520
Subdivision MASHTA ISLAND A REPLAT OF
City Key Biscayne
County Miami-Dade
State FL
Zip Code 33149

Amenities of 520 S Mashta Drive

Amenities Other
Parking Driveway
# of Garages 2
View Bay, Direct Ocean
Is Waterfront Yes
Waterfront Ocean Access,Seawall,Bay Front
Has Pool Yes
Pool In Ground

Interior of 520 S Mashta Drive

Interior Features Bedroom Layout - Split
Appliances Other
Heating Central
Cooling Central Air
Fireplace No
# of Stories 1
Stories One

Exterior of 520 S Mashta Drive

Roof Barrel, Spanish Tile
Construction Block

School Information

Elementary Key Biscayne K-8
Middle Ponce De Leon
High Coral Gables

Additional Information On 520 S Mashta Drive

Listing Courtesy of Coldwell Banker Realty
Date Listed August 12th, 2026
Zoning 2001
Foreclosure No
Short Sale No
RE / Bank Owned No

Listing Details

OfficeColdwell Banker Realty

Listing Map

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