House in Key Biscayne, FL 33149Mashta Island, 640 S Mashta Dr
$16,800,000
4
Beds4
Baths3,620
SqFt$4,641
$/SqFtUltra Luxury HouseProperty Type
1968Year Built
$4,641/SqFtPrice per sq ft
2 carsParking Spaces
Bay,GardenView
YesWaterfront
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
Listing Courtesy Of: DLS International Realty
Local Realty Services Provided By: Best of Luxury Realty
On Site: 209 DaysUpdated: 39 Days agoPage Views: 0
Features
MLS Number: A11990382
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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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
Other Key Biscayne, FL Homes & Condos Price Range Segments
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Entry-Level
Premium
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Mid-Tier
Mid-Tier
High-End
High-End
Ultra Luxury
Ultra Luxury
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