About 520 S Mashta Dr, Key Biscayne, Florida, 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.
Water Source : Public
Sewer System : PublicSewer
Community Features : Other, SeeRemarks
Parking Features : SecurityHighImpactDoors
Garage : Yes.
Garage Spaces: 2
Exterior Features : SecurityHighImpactDoors
Roof : Barrel, SpanishTile
Waterfront : Yes.
Waterfront Features : Bayfront, OceanAccess, Seawall
Architectural Style : OneStory
Property Sub-Type Additional : SingleFamilyResidence
Zoning Description : 2001
Pool Features : InGround, Pool
Heating : Yes.
Heating : Central
Cooling : Yes.
Cooling : CentralAir
Construction Materials : Block
Interior Features : BedroomOnMainLevel, FirstFloorEntry, SplitBedrooms
Flooring : Tile
Water Source : Public
Sewer System : PublicSewer
Community Features : Other, SeeRemarks
Parking Features : SecurityHighImpactDoors
Garage : Yes.
Garage Spaces: 2
Exterior Features : SecurityHighImpactDoors
Roof : Barrel, SpanishTile
Waterfront : Yes.
Waterfront Features : Bayfront, OceanAccess, Seawall
Architectural Style : OneStory
Property Sub-Type Additional : SingleFamilyResidence
Zoning Description : 2001
Pool Features : InGround, Pool
Heating : Yes.
Heating : Central
Cooling : Yes.
Cooling : CentralAir
Construction Materials : Block
Interior Features : BedroomOnMainLevel, FirstFloorEntry, SplitBedrooms
Flooring : Tile

Street Address: 520 S Mashta Dr
City: Key Biscayne
State: Florida
Postal Code: 33149
County: Miami-Dade

Property Information :
Listing Status: Active
Size: 4,177 Sqft
MLS #: A12071221
Bedrooms: 5 bd
Bathrooms: 4 ba
Price: $19,900,000
Tax Amount: 201741
Construction Status: Built in 1961
Last Modified : Aug 27 2026 1:48AM
Amenities :
Pool
View

Courtesy of: Maureen Jauregui, Coldwell Banker Realty (MLS# CBRE07)
Source MLS: MAR