640 S Mashta Dr

Key Biscayne, FL
$ 16,800,000 Beds 4 Baths 4 Sq 3,620 Virtual Tour
Monthly Estimate* How much can I afford?

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

Active

  • Price
  • $ 16,800,000
  • City
  • Key Biscayne
  • Bedrooms
  • 4
  • Full Bathrooms
  • 4
  • County
  • Miami-Dade
  • Half Bathrooms
  • 0
  • Area
  • 52
  • Lot Size
  • Zip
  • 33149
  • Sqr Footage
  • 3,620
  • Year Built
  • 1968
  • Taxes
  • $ 155651
  • Style
  • MLS#
  • A11990382
Listed By: This listing is courtesy of DLS International Realty
Data Source: Southeast Florida MLS (SEFMLS)

Features

General

Sewer Public Sewer
Heating Other
Cooling Central Air
Utilities Cable Available
Possession Close Of Escrow
Roof Barrel
Appliances Dishwasher
Garage Spaces 2
Architectural Style Other
Pool Features In Ground,Pool
Restrictions OK To Lease
Construction Materials Block
Pets Allowed Dogs OK,Yes
Year Built 1968
View Bay,Garden
Property Subtype Single Family Residence
Tax Year 2025
Waterfront Features Ocean Front
County Miami-Dade
Property Type Residential
Attached Garage true
Subdivision Name MASHTA ISLAND
Facing Direction East
Garage Y/N true
Full Baths 4
Special Listing Conditions Listed As-Is
Status Active
High School Coral Gables
City Key Biscayne
Senior Community Y/N false
Zoning Description 2001
MLS Area 52
Lot Size Units Square Feet
Lot Size Square Feet 15000
Listing Terms Cash,Conventional
Elementary School Keybiscayne
Year Built Details Resale
Tax Annual Amount 155651
Middle/Junior High School Ponce De Leon
Lease Considered Y/N false
Virtual Tour https://www.propertypanorama.com/instaview/mia/A11990382
Standard Status Active
Occupancy Type Call Agent
Property Sub Type Additional Single Family Residence
PostalCity Key Biscayne
Legal Description MASHTA ISLAND PB 60-93 LOT 9 BLK 3 LOT SIZE 100.000 X 150 OR 18642-3922 0599 1

Interior Features

Interior Amenities Bedroom on Main Level,Breakfast Area,Bathtub,Dining Area,Dual Sinks,Entrance Foyer,First Floor Entry,Living/Dining Room,Pantry,Split Bedrooms,Vaulted Ceiling(s),Walk-In Closet(s)
Flooring Other
Air Conditioning Y/N true
Total Bedrooms 4
Total Baths 4

Exterior Features

Exterior Amenities Other
Parking Features Attached,Driveway,Garage,Guest,Garage Door Opener
Lot Features < 1/4 Acre
Water Source Public
Lot Size Area 15000
Building Area Total 4990
Frontage Length 100
Private Pool true
Waterfront Y/N true
Covered Spaces 2
Road Frontage Type City Street

Amenities

  • Foreclosure
  • Views
  • Short Sale
  • New Construction
  • Adult 55+
  • Lease To Own
  • No HOA Fees
  • Furnished
  • Primary On Main
  • Air Conditioning
  • Seller Finance
  • Green
  • Fixer Upper
  • Horse
  • Golf
  • Fireplace
  • Deck
  • Garage
  • Basement
  • Pool

Affordability Calculator

$3,786

Per Month

Based on the average sale price from the Miami Beach, FL office

  • Monthly Principal & interest $2,658
  • Monthly Property Taxes $1,062
  • Monthly Home Insurance $67
Adjust Payment Options
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Let's determine your purchasing power. Working with my mortgage partner, you'll have the information you need to shop for a home with confidence.

Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA, or jumbo loans.

Mortgage calculator provided courtesy of Inside Real Estate.

Schools

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

Price History

4/3/2026 Listed $16,800,000

Property vs Zip Code Average in 33149

Price
AVG $9.24M
$16.8M
Taxes
AVG $76,969
$155,651
Year Built
AVG 1986
1968

Areas That We Cover

640 S Mashta Dr Key Biscayne, FL is a Single Family Home for sale at $16800000 with 3620 sqft and a lot size of Acre(s). 640 S Mashta Dr Key Biscayne has 4 bedrooms, 4 baths and was built in 1968. The property's zip code is 33149 which is in Key Biscayne, FL

*Information deemed reliable but not guaranteed.

Financial calculator disclaimer: Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

Mortgage calculator provided courtesy of Inside Real Estate.

All information deemed reliable, but not guaranteed, and should be independently verified. The real estate information and related content displayed on this site is provided for consumers personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

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Jennifer Hernandez

Jennifer Hernandez

305-384-6502

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