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520 S Mashta Drive, Key Biscayne, FL - photo 1

$19,900,000

520 S Mashta Drive

Key Biscayne, FL 33149

Estimated payment $119,400/month

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5Beds
4Baths
3,085Sq Ft
$6451Price/Sq Ft

Preferred partner

Kinsfolk Realty

Kinsfolk Signature Realty

Powered by Hometrino

(813) 602-0498

Highlights

No HOA
Private Pool
Garage
Built in 1961
22,216 sqft Lot

About This Home

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.

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Facts & features

Bedrooms & bathrooms

  • •Bedrooms:5
  • •Bathrooms:4
  • •Full bathrooms:0

Heating

  • •Has Heating:Yes

Interior area

  • •Total structure area:3,085 sqft
  • •Total interior livable area:3,085 sqft

Parking

  • •Parking features:N/A
  • •Garage spaces:0
  • •Has attached garage:No

Lot

  • •Size:22,216 sqft

Details

  • •Parcel number:N/A

Type & style

  • •Home type:Single Family Residence
  • •Property subtype:Residential

Materials

  • • N/A

Condition

  • •Year built:1961

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Price history

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

Listing Agent

Maureen Jauregui

Coldwell Banker Realty

Brokerage Phone: 305-361-5722

Source: Beaches MLS · MLS #A12071221

Data Powered by Home Junction, Inc.

Nearby

Schools

KEY BISCAYNE K-8 CENTER

Elementary · 0.6 mi

Supermarkets

Winn-Dixie

0.7 mi

Key Biscayne Green Market

0.9 mi

NAHUEN Gourmet Market

1.0 mi

Dining

Tasters Lane

0.3 mi

Cocina

0.3 mi

Panna

0.7 mi

Parks

Harbor Park

0.5 mi

Paradise Park

0.8 mi

Hampton Park

0.8 mi

Beaches

Crandon Park Beach

1.2 mi

Crandon Beach

2.1 mi

Hobie Island Beach Park

4.3 mi

Nearby amenity locations include data © OpenStreetMap contributors.