by Global Lifestyle Properties

Check Availability
$19,900,000
● House - For Sale

520 S Mashta Dr

Key Biscayne, FL 33149
bedrooms
5 Beds
bathrooms
4 Baths
square feet
3,085 Ft²
$114,525
Est. Monthly

About This Property

Seize a rare opportunity to create a landmark waterfront estate on one of the largest residential lots in Key Biscayne's exclusive Mashta Island enclave. Spanning an extraordinary 22,140 square feet, this exceptional property offers 138 feet of pristine water frontage and sweeping open water views, providing an unparalleled setting for a world class residence.
Plans by renowned architect, Pablo Corazzini of Vitalini Corazzini Architects, are available to the buyer, offering a thoughtfully conceived vision that takes full advantage of the property's remarkable scale, premier waterfront setting, and spectacular sunsets. The proposed design creates an extraordinary canvas for sophisticated indoor-outdoor living and entertaining, should the buyer choose to pursue the concept.
With its exceptional lot size, expansive water frontage, and coveted Mashta Island address, this is a truly irreplaceable opportunity to create a legacy estate in one of South Florida's most prestigious waterfront communities.
Unit Size
3,085 Ft²
Days on Market
65 days
Land Size
0.51 acres
Price per sqft
$6,451
Property Type
House
Property Taxes
$16,812
HOA Dues
-
Year Built
1961

Listed By

Maureen Jauregui
Fortune International Realty
Emma Jauregui
Fortune International Realty

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Last updated: 2 months ago (Miami MLS #A12071221)

Price History

Date / Event Date Event Price
Aug 12, 2026 Listed by Coldwell Banker Realty $19,900,000
Listed by Coldwell Banker Realty
Jan 6, 2025 Price Decreased $18,900,000
↓ $1M (5.5%)
Price Decreased
Oct 29, 2024 Listed $20,000,000
Listed
Seize the rare chance to create your dream estate on one of the largest lots in Key Biscayne's prestigious Mashta Island community. This 22,140-square-foot property features 138 feet of pristine water frontage, offering breathtaking open-water views—an ideal backdrop for a grand residence. Collaborate with the renowned Corazzini & Associates, known for their award-winning designs that merge elegance with functionality. Enjoy spectacular sunsets visible throughout your home, perfect for relaxation and entertaining. Included are fully approved plans and permits for a stunning 8-bedroom, 8.5-bath, 10,000-square-foot estate, ensuring a seamless start to your vision. Don’t miss this once-in-a-lifetime opportunity to establish a legacy in one of South Florida's most prestigious enclaves.
Feb 26, 2024 Sold
Sold
Jan 15, 2024 In contract -
In contract
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Property Highlights

Parking Available
Air Conditioning
With View
Parking Details
Has Garage
Has Open Parking
Parking Features: Driveway
Garage Spaces: 2
Interior Details
Full Bathrooms: 4
Interior Features: First Floor Entry, Split Bedroom, Family Room
Appliances: Other
Flooring Type: Tile
Door Features: High Impact Doors
Exterior Details
Square Footage: 3085
Architectural Style: Attached, One Story
Year Built: 1961
Waterfront Features: Ocean Access, Seawall
Building Name: MASHTA ISLAND A REPLAT OF
Building Area Total: 4177
Building Area Units: Square Feet
Construction Materials: Concrete
Pool Features: In Ground
Lot Features: 1/2 To Less Than 3/4 Acre Lot
Lot Size Area: 22140
Lot Size Units: Square Feet
Lot Size Acres: 0.508
Lot Size Square Feet: 22140
Water Source: Municipal Water
Financial Details
Tax Annual Amount: $201,741
Utilities Details
Cooling Type: Central Air
Heating Type: Central
Sewer : Public Sewer

Building Info

Overview

    General

  • Year Built: 1961
  • Effective Year Built: 1971
  • Building Count: 1
  • Bedroom Count: 3
  • Bathroom Count: 4
  • Full Bathrooms: 4
  • Partial Bathrooms: 4
  • Building Condition: 0
  • Building Quality: 0
  • Construction Type: 4
  • Building Style: 0
  • Exterior Walls Type: 7
  • Interior Walls Type: 0
  • Roof Shape Type: 0
  • Roof Cover Type: 0
  • Floor Count: 100
  • Living Units: 1
  • Floor Cover: 0
  • Basement Type: 0
  • Basement Area: 0
  • Garage Type: 0
  • Parking Space Count: 0
  • Patio Type: 8
  • Porch Type: 0
  • Pool Type: 8

    Dimensions

  • Lot Size Square Feet: 22,140
  • Lot Size Depth Feet: 1,640
  • Lot Size Frontage Feet: 1,350
  • Total Building Area: 4,177
  • Gross Building Area: 4,177
  • Building Area: 3,085
  • Building Area Measurement: L

    Heating and Cooling

  • Air Conditioning: 0
  • Heating: 0
  • Heated Square Feet: 3,085
  • Heating Fuel Type: 0

    Utilities

  • Sewer System: 0
  • Water Service: 0

Building

  • Building Type: 0
  • Property Class: R
  • Subdivision: MASHTA ISLAND
  • Land Acres: 0000000508
  • Standard Land Use Code: 1001
  • County Land Use Code: 0101
  • State Land Use Code: 001
  • Legal Description 1: 5-6 55 42 MASHTA ISLAND A REPLAT OF TRS A & C SELY35FT LOT 16 & ALL LT 17 BLK BLK 3 LOT SIZE 135.000 X 164 OR 15816-1278 1292 1

Neighborhood

  • School District Name: Dade County School District
  • School Tax School District: KEY BISCAYNE
  • Census Tract: 004602

Zoning

  • Zoning: 2001

Geography

  • Assessors Map Reference: 325
  • District: 24
  • Subdivision Tract Number: A,C
  • Parcel: 24-5205-009-0170
  • Block: 3
  • Lot: 16,17
  • Meridian: SEC 05 TWN 55S RNG 42E
  • Municipality: KEY BISCAYNE
  • Latitude: 25.6833
  • Longitude: -80.1728

    Address

  • Full Address: 520 S Mashta Dr
  • Address - House Number: 520
  • Street Direction: S
  • Address - Street Name: Mashta
  • Address - Suffix Type: Dr
  • State: FL
  • City Name: Key Biscayne
  • Carrier Code: C071
  • 4-Digit Zip Code: 1733
  • Zip Code: 33149

Valuation

    Tax

  • Total Area: 3,578
  • Tax Year: 2023
  • Tax Amount: $17,958,193
  • Tax Rate Code Area: 2400

    Market Valuation

  • Market Total Value: $11,623,601
  • Market Land Value: $11,468,520
  • Market Improvement Value: $155,081

    Assessments Valuation

  • Assessed Year: 2023
  • Assessed Total Value: $10,866,907

    Sales

  • Current Sale Contract Date: Apr 11, 2014
  • Current Sale Recording Date: Apr 23, 2014
  • Current Sale Price:
  • Current Sale Document Type: 71
  • Current Sale Input Document Number: 2014R0291071
Data used for valuation calculations is provided by RealtyHop, and other third party sources

Comparables

Unit
Status
Type
Beds
Baths
ft²
Price/ft²
Asking Price
Listed On
Closing Price
Sold On
HOA + Taxes

About Key Biscayne


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Nearby Rentals

Unit for rent at 200 Galen Drive, Key Biscayne, FL, 33149

$3,800 /mo

  • 1 Bed
  • 1 Bath
  • 690 ft²
200 Galen Drive #308, Key Biscayne, FL, 33149 Listing by Cliff Glansen


Frequently Asked Questions

When was property at 520 South Mashta Drive built and last sold?
The property at 520 South Mashta Drive was built in 1961 and last sold on Apr 11, 2014 for $8,700,000.
How much is this home worth?
The estimated value of the home located at 520 South Mashta Drive is $20,099,000.
What are some comparable homes to 520 South Mashta Drive?
There are currently no comparable homes to 520 South Mashta Drive.