For sale Home

Listed Aug 17, 2026

$18,500,000 Est. $122,361/mo

520 South Mashta Drive

  • 5

    Beds

  • 4

    Baths

  • 3,085

    Sq ft

The story

  • Pool
  • Waterfront

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.

Facts & features

Home type

Home

Year built

1961

Floors

1

Lot size

1 acres

Price per sq ft

$5,997

Parking

2-car garage

Included features

  • Pool

    Yes

  • Cooling

    Central Air

  • Heating

    Central

  • Flooring

    Tile

  • Roof

    Barrel, Spanish Tile

  • Lot Information

    Flood Zone

  • Exterior

    Security High Impact Doors

  • Water Source

    Public

  • Sewer

    Public Sewer

Mortgage calculator

Estimated monthly payment

$122,361 /mo

7% rate · 30-yr fixed · 20% down

  • Principal & interest $98,465
  • Property tax $18,500
  • Insurance $5,396

Includes principal, interest, taxes & insurance.

Your Property Journey

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Listing Broker

Coldwell Banker Realty

Broker Name

Coldwell Banker Realty

Agent

Maureen Jauregui

Location

Key Biscayne FL 33149