640 S Mashta Dr
Key Biscayne, FL 33149
4 Beds
4 Baths
3,620 sqft (on 0.34 acres)
4 Beds
4 Baths
3,620 sqft
(on 0.34 acres)
Local Information
- Map ViewExplore the area around 640 S Mashta Dr.
- Schools2 Preschool Schools1 Elementary School2 Middle Schools1 High School
- Shop & Eat
-- mins to
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 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
Home Highlights
Parking
2 Car Garage
Outdoor
Pool
View
Bay, Garden
HOA
None
Price/Sqft
$4,641
Listed
107 days ago
Home Details for 640 S Mashta Dr
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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 HeatingHeating Fuel: Other |
Windows, Doors, Floors & Walls Flooring: Other |
Levels, Entrance, & Accessibility Entry Location: First Floor Entry, FoyerFloors: Other |
View Has a ViewView: Bay, Garden |
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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 |
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Days on Market: 107 |
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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 |
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Price List Price: $16,800,000Price Per Sqft: $4,641 |
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MLS Status: Active |
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Direction & Address City: Key BiscayneCommunity: Mashta Island |
School Information Elementary School: KeybiscayneJr High / Middle School: Ponce De LeonHigh School: Coral Gables |
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Listing Agent Listing ID: A11990382 |
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Building Area Building Area: 4990 Square Feet |
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Association for this Listing: A-Miami Association of REALTORSNo HOA |
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Lot Area: 0.34 acres |
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Listing Terms: All Cash, Conventional |
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Mls Number: A11990382Water ViewWater View: Bay |
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Source Internet Entire Listing Display |
Last check for updates: about 23 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.
Market trends in Key Biscayne
Last updated June 2026
Avg. sale price
$1.58M
$113KMoM
Sale-to-List Price
—
Price per sq ft
$945
$37MoM
Available listings
159
9MoM
Price History for 640 S Mashta Dr
| Date | Price | Event | Source |
|---|---|---|---|
| 04/02/2026 | $16,800,000 | Listed For Sale | MIAMI #A11990382 |
| 03/26/2026 | $19,500,000 | ListingRemoved | MIAMI #A11896953 |
| 10/16/2025 | $19,500,000 | Listed For Sale | MIAMI #A11896953 |
| 01/22/2025 | $22,000 | ListingRemoved | MIAMI #A11671489 |
| 12/04/2024 | $22,000 | PriceChange | MIAMI #A11671489 |
| 10/16/2024 | $12,375,000 | Sold | MIAMI #A11611809 |
| 10/05/2024 | $27,000 | Listed For Rent | MIAMI #A11671489 |
| 09/20/2024 | $13,250,000 | Pending | MIAMI #A11611809 |
| 08/05/2024 | $13,250,000 | PriceChange | MIAMI #A11611809 |
| 06/26/2024 | $15,000,000 | Listed For Sale | MIAMI #A11611809 |
| 06/08/1999 | $1,550,000 | Sold | N/A |
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Property Tax and Assessment
| Year | 2025 |
|---|---|
| Tax | $155,731 |
| Assessment | $9,910,420 |
Home facts updated by county records
Comparable Sales for 640 S Mashta Dr
Address | Distance | Property Type | Sold Price | Sold Date | Bed | Bath | Sqft |
|---|---|---|---|---|---|---|---|
0.07 | Single-Family Home | $4,750,000 | 02/04/26 | 4 | 3.5 | 3,382 | |
0.35 | Single-Family Home | $3,450,000 | 07/21/25 | 4 | 3 | 3,004 | |
0.46 | Single-Family Home | $6,350,000 | 07/31/25 | 5 | 5.5 | 3,525 | |
0.46 | Single-Family Home | $3,500,000 | 01/16/26 | 4 | 3.5 | 2,775 | |
0.40 | Single-Family Home | $4,950,000 | 04/20/26 | 6 | 6 | 3,888 | |
0.68 | Single-Family Home | $4,475,000 | 04/10/26 | 4 | 3.5 | 3,666 | |
0.59 | Single-Family Home | $3,700,000 | 01/27/26 | 5 | 5 | 3,962 | |
0.40 | Single-Family Home | $3,475,000 | 01/27/26 | 5 | 4.5 | 2,320 | |
0.61 | Single-Family Home | $5,690,000 | 06/15/26 | 6 | 5 | 3,584 |
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Assigned Schools
These are the assigned schools for 640 S Mashta Dr.
- Key Biscayne K-8 Center
- PK-8
- Public
- 803 Students
8/10GreatSchools RatingParent Rating Averagethey have nothing they lost it allParent Review9mo ago - Ponce De Leon Middle School
- 6-8
- Public
- 668 Students
6/10GreatSchools RatingParent Rating AverageMi hija estudio en Ponce de León Middle School durante 3 años, y realmente su experiencia fue muy satisfactoria. El personal administrativo, los maestros, Los principales Señor Balboa durante 1 año, y posteriormente la Sra Gonzalez durante los últimos dos años, en fin todo el staff. Nos llevamos muchas buenas experiencias de este colegio. La Sra Marlene Ramos, la coordinadora de IB marca la diferencia, nos aconsejo y acompaño durante estos años cada día, dándonos los mejores consejos y asesorías. Estamos felices de haber pertenecido a esta comunidad. Muchas graciasParent Review1mo ago - Coral Gables Senior High School
- PK-12
- Public
- 2931 Students
5/10GreatSchools RatingParent Rating AverageAs a current teacher and Alumni of CGHS, this is, without a doubt, the worst school I have ever taught and studied at. The primary factor for this is the teachers, especially Diana Van-Wyk. She is the "IB Coordinator" of the school, who demonstrates clear favoritism, laziness, apathy, and sexism. As a counsellor and coordinator of such a prestige program such as the IB, I would expect her to care for her students and support them fully through their academic journey, as would most people. However, since she has joined this school years ago, I have seen a noticeable decline in student mental health, overall happiness, and communication with teachers. This is what inspired me to become a teacher, so I could be everything she isn't. Furthermore, I have received multiple student complaints about her, and her failure of communication as well as her stubbornness. I don't think she understands that the students she deals with are socially maturer than most, perhaps indicating why she refuses to admit she's wrong. It is in the best interest of the school to remove her as a faculty.Teacher Review4mo ago 
Check out schools near 640 S Mashta Dr.
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
85 % Say people would walk alone at night
85 % 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.
LGBTQ Local Legal Protections
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.
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.