520 S Mashta Dr, Key Biscayne FL 33149, photo 1
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$19,900,000

Single Family ResidenceActive
⏱️ Listed 5 days ago
5Beds
4Baths
3,085Sq Ft
1961Built

520 S Mashta Dr, Key Biscayne FL 33149

MLS #A12071221

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.

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Marie I. Sanjurjo
Licensed Broker
Blue Mar Real Estate Group
📞 (305) 680-5672💬 WhatsApp Marie✉️ [email protected]

About Key Biscayne

Key Biscayne is a barrier island community just a bridge ride from Brickell, offering an island lifestyle wrapped around Crandon Park, Cape Florida State Park, and the Crandon Golf Course. The village is known for its safety, top-rated schools, and walkable pace, with residents ranging from young families to international buyers seeking secondary residences. Limited inventory and tight geography keep prices premium relative to mainland Miami.

Explore Key Biscayne📊 Key Biscayne market report

Property Details

Property Type

Single Family Residence

Year Built

1961

Living Area

3,085 sq ft

Lot Size

22,140 sq ft

Bedrooms

5

Bathrooms

4

Garage

2 Spaces

Pool

No

Waterfront

Yes

Cooling

Central Air

Heating

Central

Roof Type

Barrel Roof, Curved/S-Tile Roof

Flooring

Tile

Construction

Concrete Block Construction

Style

Attached, One Story

HOA Fee

None

Annual Taxes

$201,741 (2026)

Days on Market

5

MLS #

A12071221

Features & Amenities

Interior

First Floor EntrySplit BedroomFamily Room

Appliances

Other Equipment/Appliances

Community

Other Subdivision - See Remarks

Other

Ocean AccessSeawallDriveway

Nearby Schools

Assigned public schools pulled from Miami-Dade County Public Schools’s official attendance-boundary data. Verify current boundaries with MDCPS before buying — zones can change year to year.

Assigned Public Schools
Elementary
Key Biscayne K-8 Center
Grades PK-8
150 W McIntire St., Key Biscayne 33149
Middle
Ponce de Leon MS
Grades 6-8
5801 Augusto St., Coral Gables 33146
High
Coral Gables Senior High
Grades 9-12
450 Bird Rd., Coral Gables 33146
Private Schools Within 5 Miles
Key Biscayne Presbyterian School1.2 mi
160 Harbor Dr, Key Biscayne
St Christophers - By-The-Sea Montessori School1.2 mi
95 Harbor Dr, Key Biscayne
St Agnes Academy1.2 mi
122 Harbor Dr, Key Biscayne
Immaculata-La Salle High School4.7 mi
3601 S Miami Ave, Miami

School data source: Miami-Dade County Open Data Hub

Location

Loading map…

City

Key Biscayne

State

FL

ZIP Code

33149

County

Miami-Dade County

$19,900,000
520 S Mashta Dr, Key Biscayne FL 33149
5Beds
4Baths
3,085Sq Ft
📞 (305) 680-5672💬 WhatsApp
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520 S Mashta Dr, Key Biscayne FL 33149$19,900,000

Listing provided by Maureen Jauregui at Coldwell Banker Realty. Data from Miami Association of REALTORS®. All information deemed reliable but not guaranteed. Listing #A12071221.