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520 S Mashta Drive, Key Biscayne, FL 33149

New Listing
$19,900,000
Property Type: Residential Bedrooms: 5 Baths: 4 Square Footage: 4,177 Status: Active
Current Price: $19,900,000 List Date: 8/12/2026 Last Modified: 8/18/2026

Description

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.

More Information MLS# A12071221

Contract Information

Comp Sale YN: No Occupant Type: Call Listing Agent Listing Date: 2026-08-12 Status: Active Original List Price: 19900000 List Price: $19,900,000 Current Price: $19,900,000

Location and Legal

County Or Parish: Miami-Dade County Parish Name: Miami-Dade City Name: Key Biscayne Municipal Code: 24 Postal Zip: 33149 Subdivision Number: 9 Flood Zone: AE Country: United States Street Number: 520 Street Direction Prefix: S Street Name: Mashta Street Suffix: Drive State Or Province: FL Postal Code: 33149 Postal Code +4: 1733 Subdivision Name: MASHTA ISLAND A REPLAT OF Area: 2520 Elementary School: Key Biscayne K-8 Middle Or Junior School: Ponce De Leon High School: Coral Gables Parcel Number: 2452050090170 Zoning: 2001

General Property Information

Adjusted Area Main: 3578 Living Area Main: 3085 Lot Size Area: 22140 Water Frontage Feet: 138 Senior Community YN: No Stories Total: 1 Pool Private YN: Yes Property Sub Type: Single Family Residence Bedrooms Total: 5 Bathrooms Total: 4 Bathrooms Full: 4 Building Area Main: 4177 Year Built: 1961 Garage YN: 1 Garage Spaces: 2 Covered Spaces: 2 Lot Size Acres: 0.51 Waterfront YN: 1 Direction Faces: East

Financial Information

Estimated Monthly Assoc Recurring Fee: 0 Membership Fee Required YN: No Tax Annual Amount: 201741 Tax Year: 2026 Tax Legal Description: 5-6 55 42 MASHTA ISLAND A REPLAT OF TRS A & C SELY35FT LOT 16 & ALL LT 17 BLK BLK 3 LOT SIZE 135.000 X 164 OR 15816-1278 1292 1

Office/Member Information

DXORIGMLSID: SEF

Amenities

Other: 1

Entry Information

Entry Level: 1

Flooring

Tile: 1

Leasing Permitted Details

Leasing Permitted YN: Yes Okay To Lease: 1

Parking Features

Driveway: 1

Property Condition

Resale: 1

Possession

Negotiable: 1

Sewer

Public Sewer: 1

Special Information

Sold As-Is: 1

Heating

Central: 1

Water Access

Ocean Access: 1

Water View

Bay: 1 Direct Ocean: 1

Appliances

Other: 1

Construction Materials

Block: 1

Interior Features

Bedroom Layout - Split: 1

Levels

One: 1

Listing Terms

Cash: 1 Conventional: 1

Other Equipment

Other: 1

Pool Features

In Ground: 1

Roof

Barrel: 1 Spanish Tile: 1

Water Source

Public: 1

Waterfront Features

Bayfront: 1 Seawall: 1

Boat and Dock Information

Dock: Yes

Boat and Dock Features

Private Dock: 1

Cooling

Central Air: 1

Showing Requirements

Call Listing Agent: 1

Master Bedroom/Bath

Master Bdrm - Ground: 1

Pool Size Details

Pool Size (WxL): 0

Storm Protection

Impact Glass: Partial

Room Types

Family Room: 1

Price Calculations

Current Price To SqFt: 6450.56

Section Details

Parcel Number MLX: 0170

Acreage Description

1/2 To Less Than 1 Acre Lot: 1

Status Change Information

Major Change Timestamp: 2026-08-12T04:00:00Z Major Change Type: New Listing Status Change Date: 2026-08-17

Originating Details

Originating System Key: 550489621 Originating System ID: M00000151

Property Features

Flooring: Tile Leasing Permitted Details: Okay To Lease Parking Features: Driveway Property Condition: Resale Appliances: Other Boat and Dock Features: Private Dock Construction Materials: Block Cooling: Central Air Heating: Central Interior Features: Bedroom Layout - Split Levels: One Listing Terms: Cash; Conventional Other Equipment: Other Pool Features: In Ground Possession: Negotiable Roof: Barrel; Spanish Tile Sewer: Public Sewer Special Information: Sold As-Is Water Access: Ocean Access Water Source: Public Water View: Bay; Direct Ocean Waterfront Features: Bayfront; Seawall Showing Requirements: Call Listing Agent Room Types: Family Room Acreage Description: 1/2 To Less Than 1 Acre Lot

Room Information

Family Room
Listing Office: Coldwell Banker Realty
Last Updated: August - 18 - 2026
520 S Mashta Drive, Key Biscayne, FL 33149- MLS# A12071221
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