520 Mashta Dr, Key Biscayne, FL 33149

For Sale $18,500,000

Days Listed

84

Beds

5

Baths

4

Interior

3085 ft2 (287m2)

For Sale
38
520 Mashta Dr, Key Biscayne, FL 33149|5 BEDS | 4 BATHS |$18,500,000

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.

| Floor Plans

  • Days On Market:
    84
    Listed:
    Aug 17, 2026
  • Size:
    3085 ft2 (287m2)
    Rooms:
    5
  • Bathrooms:
    4
    Baths Half:
    0
  • Terms:
    All Cash, Conventional
    Property Facing:
    East
  • Last Modification:
    1 week ago
    Price Change:
    -7.04%

Property Taxes and Assessment

  • Annual Tax
    $201,741
  • Tax Year
    2026
  • Maintenance Fee
    N/A
  • Association Fee
    N/A
  • Terms
    All Cash, Conventional

Property Features

Facts and features
Views
  • Bay
    Direct Ocean
    Ocean Access
    Seawall
  • Interior Features
  • First Floor Entry
    Split Bedroom
    Family Room
  • Appliances
  • Other Equipment/Appliances
  • Parking
  • Driveway
  • Other Facts
    Heating
  • Central
  • Cooling
  • Central Air
  • Flooring
  • Tile
  • Door Features
  • High Impact Doors
  • Roof
  • Barrel Roof
    Curved/S-Tile Roof
  • Water Source
  • Municipal Water
  • Sewer
  • Public Sewer
  • Amenities
    Pool Features
  • In Ground
  • Community Features
  • Other Subdivision - See Remarks
  • Architectural Style
  • Attached
    One Story
  • Construction Materials
  • Concrete Block Construction
  • Structure Type
  • House
  • Schools
    Elementary School
  • Keybiscayne
  • Middle Or Junior School
  • Ponce De Leon
  • High School
  • Coral Gables
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    Sophia K. Albrecht

    Sophia K. Albrecht

    Lic. Real Estate Broker