- Overview
- Description
- Property Details
- Location
- Facts & Features
- Getting Around
- Nearby Homes
$18,500,000
Monthly Est:$92,081
5 Beds
4 Baths4 full baths
3,085sqft
520 S Mashta Dr, Key Biscayne, FL 33149
$18,500,000
$92,081/moEst:
Get Pre-Approved
Single Family Residence
Built in 1961
$-- HOA
22,215.6 sqft lot
$5,997/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 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.
- Houzeo last checked: 3 minutes ago
- Listing updated: October 31, 2026 at 4:10 am
- Listing Provided by: Maureen Jauregui (305) 798-3124 DRE #0549977, Emma L Jauregui (786) 201-1707 DRE #3257300 | Coldwell Banker Realty (305) 361-5722
- Source: Beaches 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
22,215.6 sqft lot
Basement Area
- sqft
MLS Name
Beaches MLS
MLS Number
A12071221
MLS Status
Active
Days on Market
78
Cumulative Days on Market
79
Open House
Continue Your Journey in App
Find your dream home, receive real-time updates, and many more!
Continue Your Journey in App
Find your dream home, receive real-time updates, and many more!
Location
Facts & Features
Rooms
Bedrooms & bathrooms
Bedrooms: 5
Bathrooms: 4
Interior
Sewer
Public Sewer
Heating
Central
Cooling
Central Air
Flooring
Tile
Interior Features
Main Level Primary, Split Bedrooms
Construction
Year Built
Year Built: 1961
Home type
Single Family Residence
Roof
Barrel, Spanish Tile
Property Condition
Resale
Construction Materials
Block
Utilities & Energy
Pool Features
In Ground
Association Amenities
Other
Parking Features
Driveway
Water Source
Public
Other Features
Subdivision Name
Mashta Island A Replat Of
Price History
| Date | Event | Price |
|---|---|---|
10/23/2026 Source: | Listed for Sale | $18,500,000 -7.04% $5,997/sqft |
08/17/2026 Source: #A12071221 | Off Market | $19,900,000 $6,451/sqft |
08/14/2026 Source: #A12071221 | Listed for Sale | $19,900,000 $6,451/sqft |
08/12/2026 Source: | Price Increased | $19,900,000 +5.29% $6,451/sqft |
07/01/2025 Source: #A11684094 | Listing Removed | $18,900,000 $6,126/sqft |
Show more
Nearby Homes
Find Homes by Property Features in Key Biscayne, FL
Nearby New Homes For Sale
IDX information is provided exclusively for consumers’ personal, non-commercial use, that it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing, and that the data is deemed reliable but is not guaranteed accurate by BeachesMLS. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This data is not verified for authenticity or accuracy and may not reflect all real estate activity in the market. Based on information © 2026 BeachesMLS, Inc. All Rights Reserved.
Advertising Broker: Moe Mossa (Savvy Avenue) | Savvy Avenue, LLC
