520 S Mashta Dr Key Biscayne, FL $ 19,900,000
520 S Mashta Dr
$ 19,900,000
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520 S Mashta Dr

Key Biscayne, FL, 33149
$ 19,900,000
Bedrooms5 Baths4.0 Sq 3,085

Monthly Estimate*

$ 125,651

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Single Family Home for sale in Key Biscayne, FL

for $19,900,000 with 5 bedrooms and 4 full baths. This 3,085 square foot home was built in 1961.

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.

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Single Family Active

Price

$ 19,900,000

Bedrooms

5

Full Bath

4

Property Type

Single Family

Taxes

$ 201,741

Style

Year Built

1961

Town/City

Key Biscayne

County/Region

Miami-Dade

MLS | Web ID

A12071221

Features
General
Sewer Public Sewer
Heating Central
Cooling Central Air
Possession Closing & Funding
Roof Barrel Spanish Tile
Appliances Other
Garage Spaces 2
Architectural Style One Story
Pool Features In Ground Pool
Restrictions OK To Lease
Construction Materials Block
Year Built 1961
View Bay Ocean
Stories Count 1
Property Subtype Single Family Residence
Tax Year 2026
Waterfront Features Bayfront Ocean Access Seawall
Community Features Other See Remarks
County Miami-Dade
Property Type Residential
Subdivision Name MASHTA ISLAND A REPLAT OF
Facing Direction East
Garage Y/N true
Total Rooms 0
Full Baths 4
Special Listing Conditions Listed As-Is
Status Active
High School Coral Gables
City Key Biscayne
Disclosures None
Senior Community Y/N false
Zoning Description 2001
MLS Area 52
Lot Size Units Square Feet
Lot Size Square Feet 22140
Listing Terms Cash Conventional
Elementary School Keybiscayne
Year Built Details Resale
Tax Annual Amount 201741
Middle/Junior High School Ponce De Leon
Lease Considered Y/N false
Virtual Tour https://www.propertypanorama.com/instaview/mia/A12071221
Standard Status Active
Occupancy Type Call Agent
Property Sub Type Additional Single Family Residence
Legal Description 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
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Interior
Interior Amenities Bedroom on Main Level First Floor Entry Split Bedrooms
Flooring Tile
Air Conditioning Y/N true
Heating Y/N true
Half Baths 0
Total Bedrooms 5
Total Baths 4
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Exterior
Exterior Amenities Security/High Impact Doors
Parking Features Driveway
Water Source Public
Lot Size Area 22140
Building Area Total 4177
Frontage Length 138
Private Pool true
Waterfront Y/N true
Covered Spaces 2
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* Excluded Features
List By
Coldwell Banker Realty

Broker

carter.jauregui@gmail.com

Email

Affordability Calculator

$142,462
Per Month
88%
12%
0%
Monthly Principal & Interest
$125,651
Monthly Property Taxes
$16,812
Monthly Home Insurance
--
Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
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Nearby
3062566 Elementary School
4268812 Middle School
Coral Gables High School High School
Pricing History
DatePricePrice ChangeDescription
8/17/2026$19,900,000 Listed Price

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520 S Mashta Dr, Key Biscayne, FL, 33149 is a Single Family Home for sale at $19,900,000 with 3,085 sqft. 520 S Mashta Dr has 5 bedrooms, 4.0 baths, and was built in 1961. The property's zip code is 33149 which is in Key Biscayne, FL