520 S Mashta Dr, Key Biscayne, Florida 33149
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$19,900,000

Single Family Home for Sale, 520 S Mashta Dr, Key Biscayne, Florida 33149

  • MLS#A12071221
  • 5
  • 4
  • 287 m² (3,085 ft²)

Listed By Coldwell Banker Realty

The Single Family Home for Sale located at 520 S Mashta Dr, Key Biscayne, Florida 33149 is currently for sale. This property has 5 bedrooms, 4 bathrooms.

Date Updated : Oct 2, 2026
Shelia Gasson
Compass Florida, LLC

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.

Location

520 S Mashta Dr, Key Biscayne, Florida 33149

520 S Mashta Dr, Key Biscayne, Florida 33149

Property features

Property

  • Property size: 287 m² (3,085 ft²)
  • Features: Garage
  • Location: WaterfrontSubdivision

Lot/Land

  • Land/Lot size: 2,057 m² (22,140 ft²)

Construction

  • Year built: 1961
  • Roof type: Barrel
  • Construction: Attached

Bedrooms

  • Bedrooms: 5

Bathrooms

  • Total bathrooms: 4
  • Full bathrooms: 4

Pool and Spa

  • Pool: Inground

Water and Boating

  • Boating: Private Dock

recreational

  • recreational: Swimming Pool

View

  • Features: Ocean DirectBay View

Heating and Cooling

  • Heating System: Central
  • Cooling System: Central AC

Utilities

  • Other utilities: Public Sewer