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House in Key Biscayne, FL 33149
Mashta Island, 510 S Mashta Dr

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Closed
$18,921,250
$79K
Estimate Payment $110,044Closing Costs
5
Beds
61/2
Baths
5,226
SqFt
$3,621
$/SqFt
Sold - Jul 08, 2025
Ultra Luxury House
Built in 1981
2 Parking
Bay,Garden View
Waterfront
Two Story
Deck
Waterfront. Located on Mashta Island and island within an island in Key Biscayne. The minute you walk into the house the most breathtaking Biscayne Bay views welcomes you. Breathtaking sunsets.Oversized Lot:18,300-sq.ft. 2 story home with excellent floor plan,Large living room area w/double height ceilings, family room adjacent to Kitchen area. Large dining area w/direct water views & access to pool area. 2nd floor: Master suite & 3 additional bedrooms en suite Master suite w/balcony & large walk in closet .1st floor Guest suite.Water views from every room, dining & reception area.Gazebo by the water.Open kitchen. staff area.powder room.oversized pool w/Cabana room &cabana bath.Double access ( service access &main access) Lush garden offers total privacy . Enclosed two car garage.
MLS Number: A11782312
On Site: 543 Days
Updated: 40 Days ago
Page Views: 0

Features

Bedrooms
  • Bedrooms: 5
Bathrooms
  • Bathrooms: 6
  • Half Bathrooms: 1
Exterior and Lot Features
  • Exterior Features: Deck
  • View: Bay,Garden
Interior, Heating and Cooling
  • Interior Features: BuiltInFeatures, BedroomOnMainLevel, BreakfastArea, Bathtub, ClosetCabinetry, DualSinks, EatInKitchen, FirstFloorEntry, HighCeilings, LivingDiningRoom, SplitBedrooms, SeparateShower
  • Equipment / Appliances: Dishwasher, Refrigerator
  • Heating Description: Central,Electric
  • Cooling Description: CentralAir,Electric
Building and Construction
  • Floor Description: Hardwood,Marble,Wood
  • Year Built: 1981
  • Year Built Description: Resale
  • Style: TwoStory
Waterfront and Water Access
  • Waterfront Frontage: Yes
School Information
  • Elementary School: Keybiscayne
  • Middle School: Coral Gables Prep Academy
  • Senior High School: Mast Academy
Other Property Info
  • Garage: 2
  • Listing Date: 2025-04-11T16:22:56.000-00:00
  • Directions: East
  • Pets Allowed: Conditional,Yes
Taxes, Fees & More
  • Taxes: 172413
  • Security Information: SmokeDetectors
  • Parking Description: Attached, CircularDriveway, Driveway, Garage, GarageDoorOpener

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Price History

Current
$18.9M
High
$19M
Low
$18.9M
Total Change
-0.4%
$19M$19M$18.9MApr 25Apr 25Jul 25
Date
Event
Price
Change
Price Per
07/08/2025
Sold
$18.9M
0%
$3,621 ft2
$38,972 m2
04/11/2025
Price Reduced
$18.9M
-0.41%
$3,621 ft2
$38,972 m2
04/11/2025
Listed
$19M
 
$3,636 ft2
$39,134 m2
07/08/2025
$18.9M
Event
Sold
Change
0%
Price Per
$3,621 ft2
$38,972 m2
04/11/2025
$18.9M
Event
Price Reduced
Change
-0.41%
Price Per
$3,621 ft2
$38,972 m2
04/11/2025
$19M
Event
Listed
Price Per
$3,636 ft2
$39,134 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 .

Transit & Commute from Mashta Island

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24
Traffic score
Congested area. Frequent traffic delays
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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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