$19,900,000
520 S Mashta Drive, Key Biscayne, FL 33149
Mashta Island A Replat Of
Beds
5 Beds
Baths
4 Baths
Living Area
3,085 Sq Ft
Lot
0.51 acres
Built
1961
Days Listed
14
Price Per Sq Ft
$6,451/sqft
Listed
Aug 12, 2026
Garage
2 spaces
Property Type
Single Family Residence
Property Overview
This 5-bedroom waterfront single family residence at 520 S Mashta Drive, Key Biscayne, FL 33149 in the Mashta Island A Replat Of community on 0.51 acres with 3,085 square feet of living area, built in 1961 is listed for $19,900,000. Notable MLS signals include Dock / Boat Access, Ocean Access, Pool.
MLS Public Remarks
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.
Key Biscayne Property Snapshot
Property Type
Residential
Sub Type
Single Family Residence
Stories
1
Total Baths
4
Building Area
4,177 sq ft
Lot Size
22,140 sq ft
Lot Profile
1/2 To Less Than 1 Acre Lot
Condition
Resale
MLS #
A12071221
Waterfront, Boating & Outdoor
Waterfront
Yes
Waterfront
Ocean Access, Seawall, Bayfront
Dock
Yes
Boat Features
Private Dock
Private Pool
Yes
Pool Features
In Ground
View
Bay, Direct Ocean
Interior & Construction
Interior Features
Bedroom Layout - Split
Primary Bedroom
Master Bdrm - Ground
Rooms
Family Room
Appliances
Other
Flooring
Tile
Construction
Block
Heating
Central
Cooling
Central Air
Impact Glass
Partial
Parking, HOA & Rules
Garage Spaces
2
Parking Features
Driveway
Community / Access
Other
Taxes, Utilities & MLS
Annual Taxes
$201,741
Tax Year
2026
Parcel Number
2452050090170
Zoning
2001
County
Miami-Dade
MLS Area
2520
Sewer
Public Sewer
Water Source
Public
Photos
38
Listing courtesy of Coldwell Banker Realty
Listing Agent: Maureen Jauregui
All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright © 2026 BeachesMLS, Inc.
The data relating to real estate for sale on this website comes in part from the Internet Data Exchange (IDX) program of the BeachesMLS. Real estate listings held by brokerage firms other than Levin Investments, Inc are marked with the IDX logo and detailed information about them includes the name of the listing broker. Data provided is deemed reliable but is not guaranteed. All information is subject to change and should be independently verified.
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