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House in Key Biscayne, FL 33149
Mashta Island, 669 S Mashta Dr

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Closed
$5,200,000
$599K
Estimate Payment $28,128Closing Costs
4
Beds
31/2
Baths
3,382
SqFt
$1,538
$/SqFt
Sold - Aug 11, 2026
Ultra Luxury House
Built in 1960
Garden View
Two Story
Outdoor Shower
Located on the exclusive and highly sought-after Mashta Island, this exceptional property offers a rare opportunity to build your dream home or enjoy the existing beautifully refurbished residence. The home features new bathrooms, updated flooring, and tasteful modern finishes throughout. Designed for relaxed Florida living, the spacious covered terrace overlooks a stunning mosaic-tiled pool, creating the perfect setting for entertaining or enjoying the tropical surroundings. A unique opportunity in one of Key Biscayne's most desirable neighborhoods. Easy to show.
MLS Number: A12033340
On Site: 119 Days
Updated: 55 Days ago
Page Views: 0

Features

Bedrooms
  • Bedrooms: 4
Bathrooms
  • Bathrooms: 3
  • Half Bathrooms: 1
Exterior and Lot Features
  • Exterior Features: OutdoorShower, Patio, StormSecurityShutters
  • View: Garden
Interior, Heating and Cooling
  • Interior Features: BedroomOnMainLevel, BreakfastArea, DiningArea, SeparateFormalDiningRoom, DualSinks, GardenTubRomanTub, HighCeilings, SplitBedrooms, SeparateShower
  • Equipment / Appliances: BuiltInOven, Dryer, Dishwasher, Disposal, GasRange, Refrigerator, SelfCleaningOven, Washer
  • Heating Description: HeatStrip
  • Cooling Description: CentralAir
Building and Construction
  • Floor Description: Vinyl
  • Windows/Treatment: Blinds,ImpactGlass
  • Year Built: 1960
  • Year Built Description: Unknown
  • Style: TwoStory
Waterfront and Water Access
  • Waterfront Frontage: No info
School Information
  • Elementary School: Keybiscayne
  • Middle School: Ponce De Leon
  • Senior High School: Coral Gables
Other Property Info
  • Garage: No info
  • Listing Date: 2026-06-08T17:05:40.000-00:00
  • Directions: West
  • Pets Allowed: Conditional,Yes
Taxes, Fees & More
  • Taxes: 22013
  • Security Information: SmokeDetectors
  • Parking Description: Driveway

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Price History

Current
$5.2M
High
$5.8M
Low
$5.2M
Total Change
-10.3%
$5.9M$5.5M$5.1MJun 26Jun 26Jun 26Aug 26
Date
Event
Price
Change
Price Per
08/11/2026
Sold
$5.2M
0%
$1,538 ft2
$16,550 m2
06/08/2026
Price Reduced
$5.2M
-10.33%
$1,538 ft2
$16,550 m2
06/09/2026
Price Reduced
$5.8M
0%
$1,715 ft2
$18,457 m2
06/08/2026
Listed
$5.8M
 
$1,715 ft2
$18,457 m2
08/11/2026
$5.2M
Event
Sold
Change
0%
Price Per
$1,538 ft2
$16,550 m2
06/08/2026
$5.2M
Event
Price Reduced
Change
-10.33%
Price Per
$1,538 ft2
$16,550 m2
06/09/2026
$5.8M
Event
Price Reduced
Change
0%
Price Per
$1,715 ft2
$18,457 m2
06/08/2026
$5.8M
Event
Listed
Price Per
$1,715 ft2
$18,457 m2
Price per square foot and days on website are not provided values and are calculated by Subdivisions.
Listed by Maureen Jauregui • Coldwell Banker Realty • Buyer Agency Compensation .

Transit & Commute from Mashta Island

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24
Traffic score
Congested area. Frequent traffic delays
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Listing Location & Street View

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Scores

Walk Score®
Car-Dependent. Almost all errands require a car
8
100
Bike Score®
Somewhat Bikeable. Minimal bike infrastructure
36
100
Sound Score®
Bearable noise
80
100
Airport Score
Close to airports. Noticeable airport activity
0
100
Traffic Score
Congested area. Frequent traffic delays
24
100
Local Score
Limited local amenities nearby
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
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Key Biscayne, FL Nearby Cities

Key Biscayne, FL Price Range Segments

Entry-Level
Entry-Level
Premium
Premium
Mid-Tier
Mid-Tier9
High-End
High-End28
Ultra Luxury
Ultra Luxury20
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The data relating to real estate for sale on this web site comes in part from the Broker Reciprocity' Program of the Regional Multiple Listing Service of Miami Dade, Broward, Palm Beach, Collier and Lee Counties. Not all listings found on this site are necessarily listed through Subdivisions.com. Real estate listings held by brokerage firms other than Subdivisions.com are marked with the Broker Reciprocity' logo or the Broker Reciprocity' thumbnail logo (little black house) and detailed information about them includes the name of the listing brokers.

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