520 S Mashta Dr Key Biscayne, FL 33149
Listing Courtesy of: MIAMI / Listed By: Maureen Jauregui, Coldwell Banker Realty

  520 S Mashta Dr Key Biscayne, FL 33149

Active (6 Days)
$19,900,000 (USD)
5
BED
4
BATH
4,177
SQFT

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.

MLS #:
A12071221
Taxes
$201,741(2026)
Lot Size
0.51 acres
Type
Single-Family Home
Year Built
1961
Style
One Story
Views
Bay, Ocean
County
Miami-Dade County
Community
Mashta Island a Replat of

Listed By

Maureen Jauregui, Coldwell Banker Realty
Source
MIAMI
Last checked Aug 18 2026 at 3:11 PM EDT
Bathroom Details
  • Full Bathrooms: 4
Interior Features
  • First Floor Entry
  • Split Bedrooms
Subdivision
  • Mashta Island A Replat Of
Heating and Cooling
  • Central
  • Central Air
Pool Information
  • In Ground
  • Pool
Flooring
  • Tile
Exterior Features
  • Roof: Barrel
  • Roof: Spanish Tile
Utility Information
  • Utilities: Water Source: Public
  • Sewer: Public Sewer
School Information
  • Elementary School: Keybiscayne
  • Middle School: Ponce De Leon
  • High School: Coral Gables
Parking
  • Driveway
Stories
  • 1
Living Area
  • 3,085 sqft
Location
   
Calculate drive times to this property
 
Powered by INRIX® Drive Time

Powered by Walk Score®
Disclaimer: Copyright 2026 Miami Association of Realtors. All rights reserved. This information is deemed reliable, but not guaranteed. The information being provided is for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data last updated 8/18/26 08:11