Mashta Island, 520 S Mashta Dr

5
Beds
4
Baths
3,085
SqFt
$6,451
$/SqFt
Ultra Luxury House
Built in 1961
2 Parking
Bay,Ocean View
Waterfront
One Story
Security High Impact Doors
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.
MLS Number: A12071221
On Site: 51 Days
Updated: 41 Days ago
Page Views: 0

Features

Bedrooms
  • Bedrooms: 5
Bathrooms
  • Bathrooms: 4
  • Half Bathrooms: No info
Exterior and Lot Features
  • Exterior Features: SecurityHighImpactDoors
  • View: Bay,Ocean
Interior, Heating and Cooling
  • Interior Features: BedroomOnMainLevel, FirstFloorEntry, SplitBedrooms
  • Equipment / Appliances: Other
  • Heating Description: Central
  • Cooling Description: CentralAir
Building and Construction
  • Floor Description: Tile
  • Year Built: 1961
  • Year Built Description: Resale
  • Style: OneStory
Waterfront and Water Access
  • Waterfront Frontage: Yes
School Information
  • Elementary School: Keybiscayne
  • Middle School: Ponce De Leon
  • Senior High School: Coral Gables
Other Property Info
  • Garage: 2
  • Listing Date: 2026-08-17T17:00:09.000-00:00
  • Directions: East
Taxes, Fees & More
  • Taxes: 201741
  • Parking Description: Driveway

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Price History

Date
Event
Price
Change
Price Per
08/14/2026
Listed
$19.9M
 
$6,451 ft2
$69,434 m2
08/14/2026
$19.9M
Event
Listed
Price Per
$6,451 ft2
$69,434 m2
Price per square foot and days on website are not provided values and are calculated by Subdivisions.
Listed by Maureen Jauregui • Coldwell Banker Realty • Buyer Agency Compensation .

Transit & Commute from Mashta Island

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24
Traffic score
Congested area. Frequent traffic delays
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Scores

Walk Score®
Car-Dependent. Almost all errands require a car
8

100
Bike Score®
Somewhat Bikeable. Minimal bike infrastructure
36

100
Sound Score®
Bearable noise
80

100
Airport Score
Close to airports. Noticeable airport activity
0

100
Traffic Score
Congested area. Frequent traffic delays
24

100
Local Score
Limited local amenities nearby
0

100
Community Snapshot
4 – 5 BR
Bedrooms
$6.4M – $19.9M
Price Tier
2,255 - 10,820
SqFt Range
1972
Year Build
1
Total Floors
71
Total Units

Key Biscayne
Ultra Luxury
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