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520 S Mashta Dr
Active
+33

$19,900,000

|Est. $119,400/mo

520 S Mashta Dr, Key Biscayne, FL 33149

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5beds
4baths
3,085sqft
1961year built
ActiveResidentialSingle Family ResidenceLot 22,215 sqftHOA None22 DOMMLS# A12071221

Listed by: Maureen Jauregui, Coldwell Banker Realty 305-361-5722

Source:Beaches MLS (RAPB)|MLS #A12071221

What's special

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.

Bedrooms5
Bathrooms4
Year built1961
Home typeSingle Family Residence
Property subtypeResidential
Living area3,085 sqft
Lot size22,215 sqft
Pool featuresIn Ground
RegionKey Biscayne, FL
HOA feeNone
Price per square foot$6451/sqft
Date on market2026-08-12T00:00:00.000Z
MLS#A12071221

Preferred Brokerage Partner

Kinsfolk Realty

Kinsfolk Signature Realty

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Price history

DateEventPrice
2026-08-12T00:00:00.000ZListed for sale$19,900,000$6451/sqft

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