520 S Mashta Dr, Key Biscayne, FL 33149

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.

Property Details

Bathrooms Full

4

Bathrooms Half

0

Interior Features

First Floor Entry, Split Bedroom, Family Room

Appliances

Other Equipment/Appliances

Flooring

Tile

Heating

Central

Cooling

Central Air

Architectural Style

Attached, One Story

Garage Spaces

2

Parking Features

Driveway

Pool Features

In Ground

Building & Association

Building Name

MASHTA ISLAND A REPLAT OF

Association

No

Lot & Construction

Lot Features

1/2 To Less Than 3/4 Acre Lot

Lot Size Square Feet

22,140

Waterfront

Yes

Waterfront Features

Ocean Access, Seawall

View

Bay, Direct Ocean

Construction Materials

Concrete Block Construction

Roof

Barrel Roof, Curved/S-Tile Roof

New Construction

No

Public Records

Parcel Number

24-52-05-009-0170

Tax Annual Amount

$201,741

Tax Year

2,026

Zoning

2001

County Or Parish

Miami-Dade County

Open Houses

• Wednesday, November 4, 2026 at 5:00 PM

Location