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House in Key Biscayne, FL 33149Mashta Island, 640 S Mashta Dr
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$16,800,000
4
Beds4
Baths3,620
SqFt$4,641
$/SqFtUltra Luxury House
Built in 1968
2 Parking
Bay,Garden View
Waterfront
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
MLS Number: A11990382
On Site: 188 Days
Updated: 18 Days ago
Page Views: 0
Features
Bedrooms
- Bedrooms: 4
Bathrooms
- Bathrooms: 4
- Half Bathrooms: No info
Exterior and Lot Features
- Exterior Features: Other
- View: Bay,Garden
Interior, Heating and Cooling
- Interior Features: BedroomOnMainLevel, BreakfastArea, Bathtub, DiningArea, DualSinks, EntranceFoyer, FirstFloorEntry, LivingDiningRoom, Pantry, SplitBedrooms, VaultedCeilings, WalkInClosets
- Equipment / Appliances: Dishwasher
- Heating Description: Other
- Cooling Description: CentralAir
Building and Construction
- Floor Description: Other
- Year Built: 1968
- Year Built Description: Resale
- Style: Other
Waterfront and Water Access
- Waterfront Frontage: Yes
School Information
- Elementary School: Keybiscayne
- Middle School: Ponce De Leon
- Senior High School: Coral Gables
Other Property Info
- Garage: 2
- Listing Date: 2026-04-02T18:08:31.000-00:00
- Directions: East
- Pets Allowed: DogsOk,Yes
Taxes, Fees & More
- Taxes: 155651
- Parking Description: Attached, Driveway, Garage, Guest, GarageDoorOpener
Apples-to-Apples Comparables
Price History
Date
Event
Price
Change
Price Per
03/26/2026
Listed
$16.8M
$4,641 ft2
$49,954 m2
03/26/2026
$16.8M
Event
Listed
Price Per
$4,641 ft2
$49,954 m2
Price per square foot and days on website are not provided values and are calculated by Subdivisions.
Listed by Brigitte De Langeron • DLS International Realty • Buyer Agency Compensation .
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Scores
8
100
36
100
80
100
0
100
24
100
0
100
Community Snapshot
4 – 5 BR
Bedrooms
$6.4M – $19.9M
Price Tier
2,255 - 10,820
SqFt Range
1972
Year Build
1
Total Floors
71
Total Units
Key Biscayne Ultra Luxury Ultra Luxury Homes & Condos
- Biscayne Key Estates House9
- Cape Florida House7
- Casa Del Mar Mixed5
- Club Tower Condo4
- Grand Bay Tower Condo3
- Holiday Colony House0
- Island House Co-Op5
- Key Cassa Condo2
- Lake Villa Condo2
- Mashta Island Mixed4
- Matheson Estates House0
- Ocean Tower Condo5
- Oceana Key Biscayne Mixed6
- Resort Villa Condo2
- Sands Of Key Biscayne Condo2
- The Ritz-Carlton Key Biscayne Condo1
- Tropical Isle Homes House14
Key Biscayne, FL Nearby Cities
$999K - $23.5M
$13K - $35K
$3.8M - $57M
$8K - $50K
$3K - $110M
$2K - $240K
$5K - $148M
$2K - $85K
$228K - $6.4M
$2K - $24K
Key Biscayne, FL Price Range Segments
Entry-Level
Entry-Level
Premium
Premium
Mid-Tier
Mid-Tier9
High-End
High-End28
- Bahia Mar Of Key Biscayne Condo0
- Botanica At Key Colony Condo2
- Cape Florida Club Condo5
- Cay Polynesia Condo2
- Commodore Club East Condo3
- Commodore Club South Condo7
- Commodore Club West Condo5
- Crandon Tower Condo2
- Fernwood Homes Mixed0
- Galen Drive West Condo0
- Governors Lodge Condo0
- Grand Bay Residences Condo2
- Grand Bay Villas House0
- Grapetree Townhouses Of Key Biscayne Townhouse1
- Indies Condo1
- Key Islander Condo0
- Lake Tower Condo0
- Le Phare Key Biscayne Mixed2
- Mar Azul Condo4
- North Sunrise Condo0
- Ocean Lane Plaza Condo2
- Oceansound At Key Colony Condo1
- Solimar Of Key Biscayne Condo0
- Sunrise Drive Area Condo1
- The EmeraldBay At Key Colony Condo5
- The Pyramids At Key Biscayne Condo1
- Tidemark At Key Colony Mixed4
- Towers Of Key Biscayne Condo5
Ultra Luxury
Ultra Luxury20
- Biscayne Key Estates House9
- Cape Florida House7
- Casa Del Mar Mixed5
- Club Tower Condo4
- Gardens Of Key Biscayne Alhambra Townhouse1
- Grand Bay Estates House1
- Grand Bay Tower Condo3
- Holiday Colony House0
- Hurricane Cove House1
- Island House Co-Op5
- Key Cassa Condo2
- Lake Villa Condo2
- Mashta Island Mixed4
- Matheson Estates House0
- Ocean Tower Condo5
- Oceana Key Biscayne Mixed6
- Resort Villa Condo2
- Sands Of Key Biscayne Condo2
- The Ritz-Carlton Key Biscayne Condo1
- Tropical Isle Homes House14
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