640 S Mashta Dr, Key Biscayne, FL 33149
Property image
Property image
FOR SALE
3D VIEW
0.34 ACRES

$16,800,000

  • 4 Beds
  • 4 Baths
  • 3,620 sqft (on 0.34 acres)

640 S Mashta Dr, Key Biscayne, FL 33149

Est. Mortgage $114,711/mo*
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Home Highlights

Single-Family Home
Built in 1968
0.34 acre lot
$4,641/sqft
2 Car Garage

Local Information

  • Map ViewExplore the area around 640 S Mashta Dr.
  • Schools2 Preschool Schools1 Elementary School2 Middle Schools1 High School
  • Shop & Eat
-- mins to
Commute Destination

About this House

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
Last check for updates: about 11 hours ago
Listing courtesy of Brigitte De Langeron, (305) 244-7493
DLS International Realty
Originating MLS: A-Miami Association of REALTORS
Source: MIAMI, MLS#A11990382
Also Listed on MIAMI.

Home Details for 640 S Mashta Dr

Interior Features

Beds & Baths
Number of Bedrooms: 4Number of Bathrooms: 4Number of Bathrooms (full): 4
Dimensions and Layout
Living Area: 3620 Square Feet
Appliances & Utilities
Appliances: DishwasherDishwasher
Heating & Cooling
Heating: OtherHas CoolingAir Conditioning: Central AirHas Heating
Windows, Doors, Floors & Walls
Flooring: Other
Levels, Entrance, & Accessibility
Entry Location: First Floor Entry, FoyerFloors: Other
View
Has a ViewView: Bay, Garden

Exterior Features

Exterior Home Features
Roof: Barrel RoofExterior: OtherHas a Private Pool
Parking & Garage
Number of Garage Spaces: 2Number of Covered Spaces: 2Has a GarageHas an Attached GarageHas Open ParkingParking Spaces: 2Parking: Driveway,Guest,Garage Door Opener,Converted Garage
Pool
Pool: In GroundPool
Frontage
WaterfrontWaterfront: Ocean Access, Ocean Front, WF/Pool/Ocean AccessRoad Frontage: Public RoadOn Waterfront
Water & Sewer
Sewer: Public Sewer
Farm & Range
Frontage Length: 100Not Allowed to Raise Horses
Surface & Elevation
Elevation Units: Feet

Days on Market

Days on Market: 169

Property Information

Year Built
Year Built: 1968
Property Type / Style
Property Type: ResidentialProperty Subtype: Single Family ResidenceStructure Type: House, AttachedArchitecture: Other
Building
Building Name: Mashta IslandConstruction Materials: Concrete Block Construction
Property Information
Parcel Number: 2452050080320

Price & Status

Price
List Price: $16,800,000Price Per Sqft: $4,641

Active Status

MLS Status: Active

Media

Location

Direction & Address
City: Key BiscayneCommunity: Mashta Island
School Information
Elementary School: KeybiscayneJr High / Middle School: Ponce De LeonHigh School: Coral Gables

Agent Information

Listing Agent
Listing ID: A11990382

Building

Building Area
Building Area: 4990 Square Feet

HOA

Association for this Listing: A-Miami Association of REALTORSNo HOA

Lot Information

Lot Area: 0.34 acres

Offer

Listing Terms: All Cash, Conventional

Miscellaneous

Mls Number: A11990382Water ViewWater View: Bay

Additional Information

Source Internet Entire Listing Display

Around this home

View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

What Locals Say about Key Biscayne

At least 116 Trulia users voted on each feature.

  • 94 % Say it's walkable to grocery stores

  • 94 % Say kids play outside

  • 90 % Say it's dog friendly

  • 90 % Say it's walkable to restaurants

  • 86 % Say people would walk alone at night

  • 86 % Say there are sidewalks

  • 79 % Say it's quiet

  • 79 % Say there's holiday spirit

  • 76 % Say they plan to stay for at least 5 years

  • 68 % Say parking is easy

  • 67 % Say streets are well-lit

  • 60 % Say there are community events

  • 58 % Say neighbors are friendly

  • 54 % Say yards are well-kept

  • 52 % Say there's wildlife

  • 50 % Say car is needed

Sourced by Trulia users. Learn more about our methodology.
  • Othoniel Marlieri
    "Key Biscayne os a perfect place to leave, but need more attention about basic things like a Super Market and safe environment. "
    0
    Flag
  • Mariafedc
    "There are lots of places that are dog friendly. There’s a dog park. Many dog owners live in the area. "
    0
    Flag
  • Lladom
    "Very safe and friendly community. Excellent for growing up kids. Traffic is the downside. Best town in South Florida by large."
    0
    Flag
  • Ericazc
    "Christmas, 4th of July, and many other beautiful family events happens in the island. Great place for the kids. "
    1
    Flag
  • Deborah B.
    "Have been spending winters here for 53 years. Love the family focus, beautiful beaches and public amenities. Thoughtful services like free Freebee pick ups and transportation to shopping make the Key accessible for teens to seniors. "
    0
    Flag
  • Mati P.
    "Its beautiful, peaceful and safe. I feel great living here. It’s lush, people are friendly, and respectful. It’s a great place to raise a family. The community is very pretty, Gardenia are manicured. There’s beautiful beaches and gorgeous homes. The school is pretty good as well. "
    2
    Flag
  • Ayishamartins
    "Some places do not allow dogs but there is a dog park weather like a bunch of dogs and mostly it’s pretty nice"
    1
    Flag
  • Mati P.
    "This is a safe neighborhood, kids walk by themselves all the time. It makes me feel safe to life here. "
    1
    Flag
  • Luis D.
    "Halloween’s decoration and fully of events in that day. Many sports in Village green. The community center has many events for all the family "
    0
    Flag
  • Adrian.grottola
    "Very friendly for pets (dogs) with great special spaces for them and many dog walkers in the island."
    0
    Flag
  • Mathew P.
    "The unity and the sense of community. The safety and sense of family oriented households that attribute to a beautiful place to live. "
    0
    Flag
  • Ivan M.
    "Save and quite perfect place for a family. There are as a public transportation electric’s cars around the island. "
    1
    Flag
  • Mayra
    "Great neighborhood! They celebrate Halloween, Christmas, Easter and much more! A lot of activities and sports for kids"
    0
    Flag
  • Efrao
    "Great place to live and I don’t commute everything is close by and i walk to work. Public transportation is great "
    0
    Flag
  • Kikisammataro
    "Halloween is a big event. Saturday has a farmers market. Kids are safe. Many schools and parks. Including dog park. "
    0
    Flag
  • Mayra
    "This is a very safe family neighborhood. Kids run freely and there’s a lot of activities for them. The school is great but the classrooms have more students than it should."
    0
    Flag
  • Ljsklein
    "My building is dog friendly. It seems like most of the people have dogs and love to walk them. We all clean up after our dogs. There’s poop bags in containers around the building with a place to dispose of them. There is also a dog park on the Key. "
    0
    Flag
  • Maria
    "I don’t have dogs. There’s a very nice dog park right next to the green field. Dogs are not allowed in the field, that is why they have their dog park, but the many owners don’t follow the rules which is very annoying. Most of all when you get the smell when exercising...."
    0
    Flag
  • Fabio
    "Great Place to leave. Good people, privacy, no crime. Walkable area, beach access, wide kind of services. Thanks "
    0
    Flag
  • Dani.montenegro
    "I can’t give my opinion because I don’t have dogs, cat or any other pet. And there are many dog owners in KB but most of them are not very respectful with people who don’t. "
    0
    Flag
  • Dcas
    "Great area for kids and young families. Very safe neighborhood and extremely easy to walk or ride a bike anywhere "
    0
    Flag
  • Kiragrossman
    "They would absolutely love the dog park. There are two sides for bigger dogs and smaller dogs. Everyone is very friendly "
    0
    Flag
  • Kiragrossman
    "This is a Great place to live. The neighborhoods are safe and it’s a great location. Great for children. Good restaurants shops"
    0
    Flag
  • Sandra S.
    "I love this neighborhood, I have everything I need is quiet and safe, walk to most places and has two state parks"
    1
    Flag
  • Kimbokak
    "Friendly, kind neighbors, close to everything, and safe. You can do pretty much everything on the island, but it is more expensive."
    1
    Flag
  • Garandrew
    "I am visiting for vacations and love this place. Nice neighborhood and friendly people. Very likely I will recommend it to my friends and family. "
    0
    Flag
  • Thengea
    "If you don't have to commute out of the island it's wonderful. Otherwise, every event causes so much traffic. Living on an island is a blessing but the peoole really don't say hello or even make eye contact at the stores or parks :/"
    0
    Flag

Market trends in Key Biscayne

Last updated August 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
—
Sale-to-List Price
—
Price per sq ft
—
Available listings
142
2MoM

Home Value

Trulia Estimate
$15.2M
Since last month
$3K (0%)
Since last year
Increased$2M (+17.4%)
Since last sale
Increased$3M (+22.6%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +92% in the last 10 years
MonthEstimated value
2026
September 2026$15.17M
August 2026$15.18M
July 2026$15.12M
June 2026$15.17M
May 2026$15.29M
April 2026$15.43M
March 2026$17.17M
February 2026$17.21M
January 2026$17.28M
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
591 N Mashta Dr, Key Biscayne, FL
0.10
Single-Family Home
$14,000,000
08/03/26
4
4.5
4,290
600 Allendale Rd, Key Biscayne, FL
0.46
Single-Family Home
$3,500,000
01/16/26
4
3.5
2,775
635 Curtiswood Dr, Key Biscayne, FL
0.40
Single-Family Home
$4,950,000
04/20/26
6
6
3,888
465 Hampton Ln, Key Biscayne, FL
0.68
Single-Family Home
$4,475,000
04/10/26
4
3.5
3,666
200 W McIntyre St, Key Biscayne, FL
0.59
Single-Family Home
$3,700,000
01/27/26
5
5
3,962
670 Allendale Rd, Key Biscayne, FL
0.40
Single-Family Home
$3,475,000
01/27/26
5
4.5
2,320
762 Fernwood Rd, Key Biscayne, FL
0.61
Single-Family Home
$5,690,000
06/15/26
6
5
3,584

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
660 S Mashta Dr, Key Biscayne, FL 33149
0.04
$13,509,700
7
8.5
5,043
Off Market
631 N Mashta Drive, Key Biscayne, FL 33149
0.09
$18,500,000
4
4.5
2,255
For Sale
600 N Mashta Dr, Key Biscayne, FL 33149
0.07
$5,344,800
4
3
2,416
Off Market
571 S Mashta Dr, Key Biscayne, FL 33149
0.07
$6,350,000
4
3
2,761
For Sale
730 N Mashta Dr, Key Biscayne, FL 33149
0.15
$8,122,800
6
6.5
4,225
Off Market
591 N Mashta Dr, Key Biscayne, FL 33149
0.10
$14,000,000
4
4.5
4,290
Recently Sold
551 S Mashta Dr, Key Biscayne, FL 33149
0.11
$5,655,100
6
5
3,245
Off Market
520 S Mashta Dr, Key Biscayne, FL 33149
0.15
$19,900,000
5
4
3,085
For Sale
510 S Mashta Dr, Key Biscayne, FL 33149
0.17
$18,658,200
5
6.5
5,226
Off Market
755 Harbor Dr, Key Biscayne, FL 33149
0.26
$4,368,800
5
5.5
3,534
Off Market
Address Not Disclosed, Key Biscayne, FL 33149
0.28
$8,948,800
6
6.5
-
Off Market

Price and Tax history

DateEventPrice
Apr 2, 2026
Source: MIAMI #A11990382
Listed For Sale
$16,800,000
Mar 26, 2026
Source: MIAMI #A11896953
ListingRemoved
$19,500,000
Oct 16, 2025
Source: MIAMI #A11896953
Listed For Sale
$19,500,000
Jan 22, 2025
Source: MIAMI #A11671489
ListingRemoved
$22,000
Dec 4, 2024
Source: MIAMI #A11671489
PriceChange
$22,000
Price decreased by 100%

LGBTQ Local Legal Protections

Brigitte De Langeron, DLS International Realty
Agent Phone: (305) 244-7493
IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but not guaranteed.

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Frequently asked questions about 640 S Mashta Dr

  • What is the estimated monthly payment for 640 S Mashta Dr?
    Based on a $16,800,000 list price with 20% down at today's rates, the estimated monthly payment for 640 S Mashta Dr in Key Biscayne, FL is approximately $117,073 (about $91,238 principal & interest, $25,760 property taxes, and $75 homeowner's insurance). This is an estimate. Actual payment depends on your loan terms.
  • What do residents say about Key Biscayne?
    Residents describe Key Biscayne, FL as walkable to grocery stores, dog-friendly, and walkable to restaurants. See homes for sale in Key Biscayne, FL.
  • What are the closest schools to 640 S Mashta Dr?
    The closest schools to 640 S Mashta Dr in Key Biscayne, FL are Coral Gables Senior High School (Pre-K, rated 5/10), Key Biscayne K-8 Center (Pre-K/Elementary/Middle, rated 8/10), Ponce De Leon Middle School (rated 6/10).
  • What is 640 S Mashta Dr estimated to be worth?
    Trulia's estimated value for 640 S Mashta Dr in Key Biscayne, FL is $15,173,000.
  • Does 640 S Mashta Dr have air conditioning?
    Yes, 640 S Mashta Dr in Key Biscayne, FL has air conditioning.
  • Does 640 S Mashta Dr have a pool?
    Yes, 640 S Mashta Dr in Key Biscayne, FL has a pool.
640 S Mashta Dr, Key Biscayne, FL 33149 is a 4 bedroom, 4 bathroom, 3,620 sqft single-family home built in 1968. This property is currently available for sale and was listed by MIAMI on Apr 2, 2026. The MLS # for this home is MLS# A11990382.