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$19,900,000
Monthly Est:$99,050
5 Beds
4 Baths4 full baths
3,085sqft
520 S Mashta Dr, Key Biscayne, FL 33149
$19,900,000
$99,050/moEst:
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Single Family Residence
Built in 1961
$-- HOA
22,140 sqft lot
$6,451/sq.ft
Description
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 f...
- Houzeo last checked: 9 minutes ago
- Listing updated: August 26, 2026 at 10:29 pm
- Listing Provided by: Maureen Jauregui (305) 798-3124 DRE #0549977, Emma Jauregui (786) 201-1707 DRE #3257300 | Coldwell Banker Realty (305) 361-5722
- Source: Miami MLS-FL | MLS#: A12071221
Property Details
Status
Active
Type
Single Family Residence
No. of Stories
1
County
City
Neighborhood
--
Year Built
1961
HOA Fees
-
Finished Area
3,085 sqft
Lot Size
22,140 sqft lot
Basement Area
- sqft
MLS Name
Miami MLS
MLS Number
A12071221
MLS Status
Active
Days on Market
33
Cumulative Days on Market
14
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Facts & Features
Rooms
Bedrooms & bathrooms
Bedrooms: 5
Bathrooms: 4
Interior
Appliances
Other
Sewer
Public Sewer
Exterior Features
Security High Impact Doors
Cooling
Central Air
Interior Features
Bedroom On Main Level, First Floor Entry, Split Bedrooms
Flooring
Tile
Heating
Central
Construction
Year Built
Year Built: 1961
Home type
Single Family Residence
Construction Materials
Block
Roof
Barrel, Spanish Tile
Architectural Style
One Story
Utilities & Energy
Pool Features
In Ground, Pool
Parking Features
Driveway
Water Source
Public
Other Features
Subdivision Name
Mashta Island A Replat Of
Community Features
Other, See Remarks
Disclosures
None
Price History
| Date | Event | Price |
|---|---|---|
08/14/2026 Source: #A12071221 | Off Market | $19,900,000 $6,451/sqft |
08/14/2026 Source: | Listed for Sale | $19,900,000 +5.29% $6,451/sqft |
07/01/2025 Source: | Listing Removed | $18,900,000 $6,126/sqft |
01/06/2025 Source: | Listed for Sale | $18,900,000 +14.55% $6,126/sqft |
02/26/2024 Source: | Sold | $16,500,000 -4.07% $5,348/sqft |
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Based on information from the Southeast Florida Multiple Listing Service (SEFMLS) or from MIAMI Association of REALTORS® through Sep 20, 2026, 08:30AM. The MLS Data is deemed reliable, but is not guaranteed accurate by MIAMI REALTORS®. Accuracy of listing information is not guaranteed. Listing information is provided for personal consumer, non-commercial use, solely to identify potential properties for potential purchase. All other use is strictly prohibited and may be a violation of federal and state law. Copyright Southeast Florida MLS a/k/a SEFMLS © 2026. All rights reserved.
Advertising Broker: Randal Longo | Keys Realty Redefined
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