520 S Mashta

Key Biscayne, FL 33149

-7.04% ($1,400,000)

520 S Mashta

Key Biscayne, FL 33149

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

Listing Courtesy of Coldwell Banker Realty

Property Information

General Information
    General Information
  • For Lease: No
  • Pet Restrictions : Yes
  • County Or Parish : Miami-Dade
  • Zip Code : 33149
  • City : Key Biscayne
  • List Price : $18,500,000
    Maintenance / Tax Information
  • Tax Amount : $201,741
  • Tax Year : 2026
  • Membership Required : No
    Building Information
  • Property Type : Residential
  • Subdivision : MASHTA ISLAND A REPLAT OF
    School Information
  • Elementary School : Key Biscayne K-8
  • Middle School : Ponce De Leon
  • Senior High School : Coral Gables
Virtual Tour / Features / Utilities
    Interior
  • Room Count : 1
  • Floor Description : Tile
  • Interior Features : Main Level Primary, Split Bedrooms
  • Beds Total : 5
  • Num of Full Baths : 4
  • Num of Half Baths : 0.0
  • Spa : No
    Exterior
  • Construction Type : Block
  • Front Exposure : East
  • Pool : No
  • Pool Description : InGround
  • Roof Description : Barrel Roof, SpanishTile
    Waterfront
  • Waterfront Frontage : 138
  • Waterfront Description : Bayfront,OceanAccess,Seawall
    Parking
  • Parking Description : Driveway
    Utilities
  • Cooling Description : CentralAir
  • Heating Description : Central
  • Sewer Description : PublicSewer
Property / Lot Information
    Building Information
  • Parcel Number Free Text: 2452050090170
  • Num Garage Spaces: 2
    Lot Information
  • Lot Sq Footage : 22,140
Request Details

520 S Mashta is a waterfront home for sale in Key Biscayne, FL 33149. This property was listed for sale on Aug 17, 2026 by Coldwell Banker Realty for $18,500,000. Located in MASHTA ISLAND A REPLAT OF is a 5-bed, 4-bath, 3,085 ft² / 287 m² sqft home built in 1961.

Request Details
Mortgage Calculator

Loading...