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520 S Mashta Dr, Key Biscayne FL 33149
520 S Mashta Dr, Key Biscayne FL 33149
Florida>Key Biscayne>Village of Key Biscayne

520 S Mashta DrKey Biscayne, FL 33149

For Sale

$18,500,000

Smart Buyer Rebate $185,000

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.

Listed by Maureen Jauregui

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License #0549977

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Coldwell Banker Realty

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3057983124

Listed by Emma Jauregui

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License #3257300

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Coldwell Banker Realty

Last updated October 27, 2026

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Source: SEF #A12071221

Listing Facts

  • TypeSingle-family
  • NeighborhoodVillage of Key Biscayne
  • Bedrooms5
  • Bathrooms4
  • Days on Prevu80
  • Taxes$201,741/year
  • Size3,085 sqft
  • Price per sqft$5,997

Amenities

  • Air Conditioning
  • Parking
  • Swimming Pool

Location

Mortgage Calculator

Listing History

10/26/2026
Price Decreased
$18,500,000
08/12/2026
Listed by Coldwell Banker Realty
$19,900,000
  1. 10/26/2026$18,500,000
    Price Decreased
  2. 08/12/2026$19,900,000
    Listed by Coldwell Banker Realty

Property Details for 520 S Mashta Dr

Association

Amenities

  • Community Features: Other

Exterior

Construction

  • Roof: Barrel, Spanish Tile
  • Stories: 1
  • Year Built: 1961
  • Year Built Details: Resale
  • Architectural Style: One Story
  • Construction Materials: Block

Features

  • Direction Faces: East
  • Pool Features: In Ground, Private
  • Pool Private: Yes
  • View: Bay, Ocean
  • Waterfront Features: Ocean Access, Seawall
  • Waterfront: Yes

Measurements

  • Building Area Total: 4,177
  • Frontage Length: 138
  • Lot Features: Waterfront
  • Lot Size Area: 22,140
  • Lot Size Square Feet: 22,140
  • Lot Size Units: Square Feet

Financial

Taxes

  • Parcel Number: 24-52-05-009-0170
  • Tax Annual Amount: $201,741.00
  • Tax Year: 2026

Interior

Features

  • Appliances: Other
  • Flooring: Tile
  • Interior Features: Master Downstairs

Measurements

  • Living Area: 3,085

Rooms

  • Bathrooms Full: 4
  • Bathrooms Total Integer: 4
  • Bedrooms Total: 5

Other

Location

  • Subdivision Name: MASHTA ISLAND A REPLAT OF

Parking

Parking

  • Covered Spaces: 2
  • Garage Spaces: 2
  • Garage: Yes
  • Parking Features: Driveway

Schools

Elementary School

  • Elementary School: Keybiscayne

High School

  • High School: Coral Gables

Middle or Junior School

  • Middle Or Junior School: Ponce De Leon

Utilities

Equipment

  • Cooling: Central Air
  • Has Cooling: Yes
  • Heating: Central
  • Has Heating: Yes
  • Sewer: Public Sewer
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this single-family home have?

There are 5 bedrooms and 4 bathrooms in this single-family home at 520 S Mashta Dr.

What schools are nearby to 520 S Mashta Dr?

Nearby schools include the Keybiscayne Elementary School, Ponce De Leon Middle School, and Coral Gables High School.

Does this single-family home have parking?

Yes, there are 2 parking spaces available for 520 S Mashta Dr.

What are the annual taxes for 520 S Mashta Dr?

Annual taxes for this single-family home are estimated at $201,741.

How does 520 S Mashta Dr compare to other single-family homes in Village of Key Biscayne?

This single-family home is listed 51% above the average price for single-family homes in Village of Key Biscayne and has been on the market for 121 less days than the typical home in this area.

What is the square footage on this single-family home?

According to the MLS, this listing is 3,085 sqft.

520 S Mashta Dr is a 5-bedroom, 4-bath single-family home for sale in Key Biscayne FL 33149. Listed on Prevu for 80 days at $18,500,000. This includes a recent price decrease of $1,400,000. This property features 3,085 square feet of living space, located in Village of Key Biscayne. The median listing price for single-family homes in this area is $2,400,000. Nearby schools include Keybiscayne Elementary School, Ponce De Leon Middle School, and Coral Gables High School. Property amenities include air conditioning, parking, and swimming pool. Explore more single-family home listings in Key Biscayne.

Based on information from Miami Association of REALTORS and/or other sources. All data, including all measurements and calculations of area, is obtained from various sources and has not been, and will not be, verified by Prevu or the MLS. Information is provided exclusively for consumer's personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumer may be interested in purchasing.

Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.