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For Sale
Listed on August 12, 2026

520 S MASHTA DR

$18,500,000
5 Beds
4 Baths
3,085 sqft
2 Parkings
Lot size:
22,140 sqft
Annual Tax:
$201,741
Occupancy:
Contact Agent
Year Built:
1961
Property type:
House
#MLS:
A12071221

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.
Coldwell Banker Realty

Features & Details

Learn about the features and details of 520 S MASHTA DR

Property Details

  • Property Type
    SingleFamilyResidence
  • Living Area
    3,085 sqft
  • Year Built
    1961
  • Lot Size
    22,140 sqft
  • Stories
    -
  • Annual Tax
    $201,741
  • List Date
    8/12/2026
  • Updated
    10/24/2026
  • Last Checked
    Recent
  • MLS Number
    #A12071221
  • Brokerage
    Coldwell Banker Realty
  • Postal Code
    33149
  • Area
    Miami-Dade
  • City
    Key Biscayne

Additional Property Features

  • Occupancy
    CallAgent
  • List Price
    $18,500,000
  • Unit Number
    -
  • Construction
    Block
  • Heating
    Central
  • Fireplaces
    -
  • Garage
    2 Car Garage
  • Parking Type
    No
  • Pets Allowed
    No
  • Air Conditioning
    Central Air
  • Elevator
    No
  • Locker
    No
  • Swimming Pool
    InGround,Pool
  • Patio
    No
  • Basement
    No
  • Den
    No
  • Central Vacuum
    No
  • Garage Type
    No

Additional Listing Information

  • Walk Score
    –
  • Property Manager
    -
  • Utilities Included
    None
  • Furnished
    No
  • Assessment Year
    2026
  • Assignment
    No
  • Extras Included
    Other
  • Virtual Tour
    View virtual tour

Inside

  • Bedrooms & Baths
    5 Bed, 4 Bath
  • Bedrooms
    5
  • Full Bathrooms
    4
  • Ensuite
    Yes
  • Bathrooms
    4
  • Flooring
    Mixed

Price history

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Explore Miami-Dade

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Similar listings

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PRICE CUT
520 S MASHTA DR - 138
$18,500,000
5bd4ba3,085sqft
520 S MASHTA DR
MLS A1207122175 days ago

FAQs About 520 S MASHTA DR

520 S MASHTA DR, MLS® A12071221 has a size of 3085 sqft.

There are 5 bedrooms and 4 bathrooms in this House at 520 S MASHTA DR, MLS® A12071221.

Yes, there is parking available with 2 spot(s).

Annual taxes for this home are $201,741 based on 2026 tax year reports.
Miami Association of REALTORS®
Based on information from the Miami Association of REALTORS®. This information is for your personal, non-commercial use and may not be used for any purpose other than to identify prospective properties you may be interested in purchasing. Display of MLS data is usually deemed reliable but is NOT guaranteed accurate by the MLS. All properties are subject to prior sale or withdrawal. All information provided is deemed reliable but is not guaranteed accurate, and should be independently verified. Unless otherwise specified in writing, Broker/Agent has not and will not verify any information.
©2025 Miami Association of REALTORS® all rights reserved.
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520 S MASHTA DR
520 S MASHTA DR