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$19,500,000

  • For Sale
  • Active
  • Single Family
  • 5 Beds
  • 5 Full Baths
  • 3,620 Sq. Ft.
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Welcome to your own slice of paradise! Enjoy breathtaking sunsets from your private dock on this waterfront property boasting 100 feet of direct Biscayne Bay frontage. Ideally located on Mashta Island. Set on a 15,000 SF lot, the home features 5 beds, 5 baths, including 2 bayfront primary suites with stunning views, impact windows and doors throughout. The open-concept layout flows seamlessly from the living and dining areas to the modern kitchen and out to the pool and entertainment patio, with floor-to-ceiling glass doors that open to blend indoor and outdoor living. Tranquil guest suite upstairs offering privacy and views. It also features an oversized 2-car garage, covered parking, and a spacious driveway for guests. Perfect to move in, renovate, or build your dream waterfront estate.

Full Property Details for 640 S Mashta Dr

General

  • Price: $19,500,000
  • Taxes: $81,859 (2024)
  • Status: Active
  • Type: Single Family
  • Source: Greater_Miami
  • MLS ID: A11896953
  • Updated: 10/17/2025
  • Added to Site: 93 day(s) ago

Interior

  • Interior Features: First Floor Entry, Built-in Features, Other
  • Appliances: Dishwasher, Dryer, Microwave, Washer
  • Flooring: Tile, Wood

Rooms

Bathrooms

  • Total Bathrooms: 5
  • Full Bathrooms: 5

Bedrooms

  • Total Bedrooms: 5
  • Bedroom Features: Entry Level

Other Rooms

  • Living Room: Other Sq. Ft.

Additional Information

  • Pool: Yes
  • Pool Description: In Ground

Parking

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

Location

  • Area: Mashta Island
  • County: Miami-Dade County
  • Subdivision: MASHTA ISLAND
  • Building Name: MASHTA ISLAND
  • Direction Faces: East

School Information

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

Community

  • Community Name: Mashta Island

Heating & Cooling

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

Utilities

  • Sewer: Public Sewer
  • Water: Municipal Water

Structural Information

  • Architectural Style: Detached, Two Story
  • Structure Type: House
  • Detached/Attached: Detached
  • Construction: Concrete Block Construction, CBS Construction
  • Roof: Flat Tile
  • Doors: High Impact Doors
  • Building Size: 4990
  • Square Feet: 3,620
  • Living Area: 3,620 Sq. Ft.
  • Year Built: 1968

Lot Features

  • Property View: Bay, Ocean
  • Lot Size (Sq. Ft.): 15,000
  • Frontage: Bay
  • Lot Features: Less Than 1/4 Acre Lot
  • Zoning: 2001

Water Features

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

Financial Considerations

  • Price Per Sq. Ft.: $5,386.74
  • Tax Amount: $81,859
  • Tax Year: 2024
  • Terms: All Cash, Conventional

Disclosures and Reports

  • Legal Description: MASHTA ISLAND PB 60-93 LOT 9 BLK 3 LOT SIZE 100.000 X 150 OR 18642-3922 0599 1
  • Restrictions: Ok To Lease
  • Inclusions: Private Dock, Unrestricted Salt Water Access
  • Property ID: 24-52-05-008-0320

Listed by DLS International Realty

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Listing agent

— 640 S Mashta Dr —

  • DLS International Realty

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 640 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
6-86.4 mi
Coral Gables Senior High School
450 Bird Road, Coral Gables, FL 33146
9-126.5 mi
Disclaimer: School attendance boundaries provided by Pitney Bowes and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 640 S Mashta Dr Get Price Alerts and Save Property

Date
Details
Price
Change
Source
10/15/2025
Listed
$19,500,000
57.58%
MLS
10/10/2024
Sold
$12,375,000
—
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 640 S Mashta Dr

Year
Property Taxes
Change
Tax Assessment
Change
2024
$81,859
1%
$5,157,166
3%
2023
$80,770
3%
$5,006,958
6%
2021
$78,116
—
$4,719,539
-3%
2022
$77,770
—
$4,861,125
4%
2021
$78,116
5%
$4,654,378
2%
2019
$74,698
5%
$4,549,735
2%
2018
$70,884
1%
$4,464,902
2%
2017
$70,022
—
$4,373,068
2%
2016
$70,220
-1%
$4,283,123
1%
2015
$71,257
-2%
$4,253,350
1%
2014
$72,343
2%
$4,219,594
1%
2013
$70,964
—
$4,157,236
—
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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NMLS#: 1598647

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Listed by DLS International Realty

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640 S Mashta Dr, Key Biscayne, FL 33149 (MLS# A11896953) is a Single Family property with 5 bedrooms and 5 full bathrooms. 640 S Mashta Dr is currently listed for $19,500,000 and was received on October 15, 2025. Want to learn more about 640 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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