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Waterfront

Waterfront 5-Bedroom Residence in Key Biscayne

520 S Mashta Dr, Key Biscayne FL 33149, Key Biscayne, FL 33149

$19,900,000

Listing photo 1

Key Facts

Beds
5
Baths
4
Sq Ft
3,085
Lot
22,140 sq ft
Year Built
1961
Waterfront

About This Home

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.

Features & Amenities

  • Waterfront
  • 2-car garage
  • Built 1961
  • First Floor Entry
  • Split Bedroom
  • Family Room
  • In Ground
  • Bay
  • Direct Ocean

Location

520 S Mashta Dr, Key Biscayne FL 33149, Key Biscayne, FL

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MLS # A12071221 · Listing courtesy of Coldwell Banker Realty

Data last updated August 26, 2026

Listing information is provided in part by the IDX program of the MIAMI Association of REALTORS®. Information 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.