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$19,900,000

  • For Sale
  • Active
  • Single Family
  • 5 Beds
  • 4 Full Baths
  • 3,085 Sq. Ft.
  • Updated 4 days ago
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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.

Full Property Details for 520 S Mashta Dr

General

  • Price: $19,900,000
  • Taxes: $201,741 (2026)
  • Status: Active
  • Type: Single Family
  • Source: Greater_Miami
  • MLS ID: A12071221
  • Updated: 8/17/2026
  • Added to Site: 12 day(s) ago

Interior

  • Interior Features: First Floor Entry, Split Bedroom, Family Room
  • Appliances: Other Equipment/Appliances
  • Flooring: Tile

Rooms

Bathrooms

  • Total Bathrooms: 4
  • Full Bathrooms: 4

Bedrooms

  • Total Bedrooms: 5
  • Bedroom Features: At Least 1 Bedroom Ground Level

Other Rooms

  • Living Room: Family Room Sq. Ft.

Additional Information

  • Pool: Yes
  • Pool Description: In Ground

Parking

  • Garage: Yes
  • Garage Spaces: 2
  • Covered Spaces: 2
  • Parking Features: Driveway

Location

  • Area: Mashta Island A Replat Of
  • County: Miami-Dade County
  • Subdivision: MASHTA ISLAND A REPLAT OF
  • Building Name: MASHTA ISLAND A REPLAT OF
  • Direction Faces: East

School Information

  • Elementary School: Keybiscayne
  • Middle School: Ponce De Leon
  • High School: Coral Gables

Community

  • Community Name: Mashta Island A Replat Of

Heating & Cooling

  • Air Conditioning: Yes
  • Cooling Type: Central Air
  • Heating Type: Central

Utilities

  • Sewer: Public Sewer
  • Water: Municipal Water

Structural Information

  • Architectural Style: Attached, One Story
  • Structure Type: House
  • Detached/Attached: Detached
  • Construction: Concrete Block Construction
  • Roof: Barrel Roof, Curved/S-Tile Roof
  • Doors: High Impact Doors
  • Building Size: 4177
  • Square Feet: 3,085
  • Living Area: 3,085 Sq. Ft.
  • Year Built: 1961

Lot Features

  • Property View: Bay, Direct Ocean
  • Lot Size (Sq. Ft.): 22,140
  • Frontage: Bay
  • Frontage Feet: 138
  • Lot Features: 1/2 To Less Than 3/4 Acre Lot
  • Zoning: 2001

Water Features

  • Water Front: Yes
  • Water View: Yes
  • Water Front Desc.: Ocean Access, Seawall

Financial Considerations

  • Price Per Sq. Ft.: $6,450.57
  • Tax Amount: $201,741
  • Tax Year: 2026
  • Terms: All Cash, Conventional

Disclosures and Reports

  • 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
  • Restrictions: Ok To Lease
  • Inclusions: Private Dock
  • Property ID: 24-52-05-009-0170
Buyer's Brokerage Compensation: Contact Listing Agent
Not binding unless confirmed by separate agreement among applicable parties.

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— 520 S Mashta Dr —

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NMLS#: 1598647

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Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

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Schools serving 520 S Mashta Dr

School District:Dade County School District
NameGradesDistance
Key Biscayne K-8 Center
150 West McIntyre Street, Key Biscayne, FL 33149
PK-50.6 mi
Ponce De Leon Middle School
5801 Augusto Street, Coral Gables, FL 33146
6-86.5 mi
Coral Gables Senior High School
450 Bird Road, Coral Gables, FL 33146
9-126.6 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 520 S Mashta Dr Get Price Alerts and Save Property

Date
Details
Price
Change
Source
8/12/2026
Listed
$19,900,000
20.61%
MLS
2/23/2024
Sold
$16,500,000
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 520 S Mashta Dr

Year
Property Taxes
Change
Tax Assessment
Change
2025
$218,766
13%
$13,967,621
9%
2024
$194,171
8%
$12,774,815
10%
2023
$179,582
21%
$11,623,601
25%
2021
$148,902
-7%
$9,313,016
-13%
2022
$160,168
4%
$10,671,647
19%
2021
$154,367
4%
$8,981,814
—
2019
$148,733
3%
$8,982,712
—
2018
$143,889
-14%
$8,983,609
-15%
2017
$167,074
3%
$10,534,307
14%
2016
$162,580
14%
$9,267,533
10%
2015
$142,423
1%
$8,425,030
10%
2014
$140,649
17%
$7,688,036
10%
2013
$120,405
—
$6,989,124
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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520 S Mashta Dr, Key Biscayne, FL 33149 (MLS# A12071221) is a Single Family property with 5 bedrooms and 4 full bathrooms. 520 S Mashta Dr is currently listed for $19,900,000 and was received on August 12, 2026. This property is listed by Maureen Jauregui from our Global Luxury Bayfront Office.Want to learn more about 520 S Mashta Dr? Do you have questions about finding other Single Family real estate for sale in Key Biscayne? You can browse all Key Biscayne real estate or contact a Coldwell Banker agent to request more information.

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