640 S Mashta Dr

Key Biscayne, FL 33149

$19,500,000
Price
5
Beds
3,620 Sq. Ft.
$5,387 / Sq. Ft.
3,620
Sq. Ft.
$5,387
per Sq. Ft.
a view of a balcony with wooden floor and outdoor seating
a view of an ocean with city
an aerial view of a house having garden
an aerial view of a houses with a lake
a view of a swimming pool with a patio and a yard
a living room with furniture and a large window
a view of a patio with a table and chairs
a dining room with furniture and large windows
a living room with furniture
a living room with furniture and a table
a living room with furniture a table and chairs
a living room with furniture a rug and a flat screen tv
a bathroom with a granite countertop sink a toilet and shower
a spacious bedroom with a bed and window
a living room with furniture and a large window
a bathroom with a sink toilet and shower
a bedroom with a bed and a potted plant
a bedroom with a bed a glass top table and a large window
a living room with furniture and a large window
a bedroom with a bed and a cabinets
a bed room with a bed and a chair
a bathroom with a toilet a sink and mirror
a kitchen with sink cabinets and window
a kitchen with white cabinets stainless steel appliances and sink
a view of a backyard with sitting area
a kitchen with a table and chairs in it
a kitchen with a dining table chairs and wooden floor
a kitchen with white cabinets and white appliances
a living room with furniture and a large window
a living room with furniture and a table
a living room with furniture
a dining room with furniture large windows and wooden floor
a view of a dining room with furniture and a potted plant
a view of a swimming pool with lawn chairs with plants and palm trees
an aerial view of a house with outdoor space patio and trees all around
a view of a house with backyard porch and sitting area
a view of a swimming pool with a patio
a view of a swimming pool with a patio
a view of a swimming pool with a lounge chairs
a view of a terrace with lawn chairs
a view of a house with backyard and sitting area
a view of a swimming pool with a patio
a view of outdoor space with a lake view
a front view of a house with a yard and garage
an aerial view of ocean and residential houses with outdoor space
a view of a city

Description

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...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.
  1. Listed by Claudia Fontecilla • DLS International Realty

Property Details for 640 South Mashta Drive

Subdivision
MASHTA ISLAND
Style
WF/Pool/Ocean Access
Waterfront
Yes
Waterfront Description
Bay Front, Ocean Front
View
Bay, Ocean View
Area
52
Sq Ft Total
4990
Sq Ft Liv Area
3620.0
LISTING UPDATED: 10/17/2025 12:00 AM

Property Details for 640 South Mashta Drive

StatusActive
MLS #A11896953
Days on Market69
Taxes$81,859 / year
HOA Fees-
Condo/Co-op Fees-
Compass TypeSingle Family
MLS TypeSingle Family / Single
Year Built1968
Lot Size0.34 AC / 15,000 SF
CountyMiami-Dade County

Location

Listing Courtesy of DLS International Realty
Add your commute

Building Information for 640 South Mashta Drive

Stories2Year Built1968Building Size-Lot Size0.34 AC / 15,000 SF

Payment Calculator

$103,178 per month

30 year fixed, 6.28% Interest

Principal and Interest

$96,356

Property Taxes

$6,822

HOA Dues

$0

The Payment Calculator is for illustrative purposes only.

Property Information for 640 South Mashta Drive

Location Information
Schools
  • Elementary School: Keybiscayne
  • Middle School: Ponce De Leon
  • Senior High School: Coral Gables
Location Information
  • Parcel Number Free Text: 24-52-05-008-0320
  • Parcel Number MLX: 0320
  • MLS Area: 52
  • Municipal Code: 24
  • Township Range: 52
  • Section: 5
  • Subdivision Number: 8
  • Subdivision Complex Bldg: MASHTA ISLAND
  • Zoning Information: 2001
General Information
Parking
  • Num Garage Spaces: 2
  • Parking Description: Circular Drive, Covered Parking, Driveway
General Information
  • Front Exposure: East
  • Housing Older Persons Act: No HOPA
  • Property Sq Ft: 15000
  • Lot Description: Less Than 1/4 Acre Lot
  • Waterfront Frontage: 0
  • Water Access: Private Dock, Unrestricted Salt Water Access
  • Pool: Yes
  • Pool Description: Below Ground Pool
  • Pool Dimensions: 0
  • Design: Detached
  • Design Description: Two Story
  • Construction: Concrete Block Construction, CBS Construction
  • Construction Type: Concrete Block Construction, CBS Construction
  • Roof Description: Flat Tile Roof
  • Flooring: Tile Floors, Wood Floors
  • Floor Description: Tile Floors, Wood Floors
  • Virtual Tour: https://www.propertypanorama.com/instaview/mia/A11896953
Room Information
Room Information
  • Rooms Description: Other
  • Bedroom Description: Entry Level
Additional Property Information
Utilities
  • Heating Description: Central Heat
  • Cooling Description: Central Cooling
  • Water Description: Municipal Water
  • Sewer Description: Municipal Sewer
Additional Property Information
  • Guest Accommodations: No
  • Room Count: 0
  • Interior Features: First Floor Entry, Built-Ins
  • Equipment Appliances: Dishwasher, Dryer, Microwave, Washer
  • Exterior Features: High Impact Doors
  • Subdivision Information: No Subdiv/Park Info
Financial Information
Financial Information
  • Type of Association: None
  • Flood Zone: AE
  • Tax Year: 2024
  • Tax Information: Tax Reflects No Exemptions
  • Special Information: As Is

Property History for 640 South Mashta Drive

DateEvent & SourcePriceAppreciation
Oct 15, 2025

Listed (Active)

MiamiRE #A11896953

$19,500,000—
Oct 16, 2024

Sold

MiamiRE #A11611809

$12,375,000—
Oct 10, 2024

Sold (Public Record)

Public Record #1544017521

$12,375,000—
Sep 20, 2024

Pending

MiamiRE #A11611809

—
Sep 20, 2024

Backup Contract

MiamiRE #A11611809

—
Aug 20, 2024

Listed (Active)

MiamiRE #A11611809

—
Aug 19, 2024

Expired

MiamiRE #A11611809

—
Aug 5, 2024

Price Change

MiamiRE #A11611809

$13,250,000—
Jun 25, 2024

Listed (Active)

MiamiRE #A11611809

$15,000,000—
DateEvent & SourcePrice
10/15/2025

Listed (Active)

MiamiRE #A11896953

$19,500,000
10/16/2024

Sold

MiamiRE #A11611809

$12,375,000
10/10/2024

Sold (Public Record)

Public Record #1544017521

$12,375,000
09/20/2024

Pending

MiamiRE #A11611809

—
09/20/2024

Backup Contract

MiamiRE #A11611809

—
08/20/2024

Listed (Active)

MiamiRE #A11611809

—
08/19/2024

Expired

MiamiRE #A11611809

—
08/05/2024

Price Change

MiamiRE #A11611809

$13,250,000
06/25/2024

Listed (Active)

MiamiRE #A11611809

$15,000,000

For completeness, Compass often displays two records for one sale: the MLS record and the public record.

Public Records for 640 South Mashta Drive

Taxable ValueLand-Additions-Total-
Tax Record2024$81,859 ($6,822 / month)
Home Facts
Beds4Total Finished SqFt3,620 SqFtAbove Grade Finished SqFt3,620 SqFtStories2Lot Size15,000 SqFtStyleSingle Family ResidenceYear Built1968Year Renovated1990Zoning2001CountyMIAMI-DADEAPN24-5205-008-0320

Schools near 640 South Mashta Drive

This home is within Miami-Dade County Public Schools.
Rating
School
Type
Grades
Distance
Air Base K-8 Center for International Education
Public - PK to 8
Key Biscayne K-8 Center
Public - PK to 8
Ponce De Leon Middle School
Public - 6 to 8
Robert Morgan Voc-Tech Institute
Public - 9 to 12
Rating
School
Distance
Air Base K-8 Center for International Education
PublicPK to 8

Key Biscayne K-8 Center
PublicPK to 8

Ponce De Leon Middle School
Public6 to 8

Robert Morgan Voc-Tech Institute
Public9 to 12

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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More information about 640 South Mashta Drive, Key Biscayne, FL 33149

640 South Mashta Drive is a single family home for sale in Key Biscayne, FL 33149. This property was listed for sale on October 15, 2025 by DLS International Realty, it's currently listed at $19,500,000. It has been on the market for a total of 69 days and was last sold on October 16, 2024. This listing's school district is Miami-Dade County Public Schools. Nearby schools include Air Base K-8 Center for International Education, Key Biscayne K-8 Center and Ponce De Leon Middle School. 640 South Mashta Drive is a 5-bed, 5-bath, 3,620 sqft single family home built in 1968.

No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of descriptions or measurements (including square footage measurements and property condition), such should be independently verified, and Compass, Inc., its subsidiaries, affiliates and their agents and associated third parties expressly disclaims any liability in connection therewith. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. Offers of compensation are subject to change at the discretion of the seller. No financial or legal advice provided. Equal Housing Opportunity. Subject to change at any time. Compass makes no guarantee, warranty or representation regarding the accuracy of any waterfront feature, water view or waterfront view.

Listing Courtesy of DLS International Realty

Based on information from one of the following Multiple Listing Services: Beaches Multiple Listing Service, Inc., Martin County REALTORS® of the Treasure Coast, Inc., Miami Association of REALTORS®. Information being provided is for the visitor’s personal, noncommercial use and may not be used for any purpose other than to identify prospective properties visitor may be interested in purchasing. The data contained herein is copyrighted by Beaches Multiple Listing Service, Inc., Martin County REALTORS® of the Treasure Coast, Inc., Miami Association of REALTORS® is protected by all applicable copyright laws. Any dissemination of this information is in violation of copyright laws and is strictly prohibited. Property information referenced on this web site comes from the Internet Data Exchange (IDX) program of the MLS. This web site may reference real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. For the avoidance of doubt, the accuracy of all information, regardless of source, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals.