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    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 1
    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 2
    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 3
    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 4
    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 5
    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 6
    520 S Mashta Dr, Key Biscayne FL 33149 - Key Biscayne, FL - Photo 7
    38 Photos

    520 S Mashta Dr, Key Biscayne FL 33149

    Single Family ResidenceActive Listed Date 8-12-2026

    $19,900,000.00

    $6450.57/sq ft

    Property Description

    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, ...

    Property Details

    MLS#:

    A12071221

    Price:

    $19,900,000

    Type:

    Single Family

    Living Area:

    3,085 Sq Ft

    Bedrooms:

    5

    Bathrooms:

    4

    Property Status:

    Active

    Car Garage:

    2

    Year Built:

    1961

    Lot Size:

    22,140 Sq Ft

    Tax Annual:

    $201,741

    Property Location

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    Interior

    Bedrooms
    Bedrooms: 5
    Bathrooms
    Bathrooms Total: 4.00
    Bathrooms Full: 4
    Bathrooms Half: 0
    Appliances Other Equipment/Appliances
    Flooring Tile
    Interior Features
    • First Floor Entry
    • Split Bedroom
    • Family Room
    Door Features: High Impact Doors
    Heating: Central
    Cooling: Central Air

    Exterior

    Parking Features
    Garage: Yes
    • Driveway
    Pool
    Private Pool: Yes
    • In Ground
    View
    • Bay
    • Direct Ocean

    Community / HOA Info

    Association: No
    Type of Association: None
    Association Amenities Other Subdivision - See Remarks
    Senior Community / Over 55: No
    Pets Allowed:

    Additional Property Info

    Tax (Annual): $201,741
    Tax Year: 2026
    Tax Exemption: Tax Reflects No Homestead Exemption
    Lot Size: 22,140 Sqf
    Parcel Number: 24-52-05-009-0170
    Year Built: 1961
    Water Front: Yes
    Water Front Features: Not Available
    Subdivision: MASHTA ISLAND A REPLAT OF

    School Information

    Elementary School: Keybiscayne
    High School: Coral Gables

    Building Structure

    Construction Materials Concrete Block Construction
    Structure Type: House
    Roof
    • Barrel Roof
    • Curved/S-Tile Roof

    Mortgage Calculator

    Listing Details

    Listing Source: A-Miami Association of REALTORS
    Data Status: MLS Data Checked Every 15 Minutes
    Listing Office: Coldwell Banker Realty
    Listing Office #: 305-361-5722

    Equal Housing Opportunity. The multiple listing information is provided by the Miami Association of REALTORS®, from a copyrighted compilation of listings.

    Inquire About Property
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    Realsperity
    954-644-1052
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    Brokerage Information

    7401 Wiles Rd, Suite# 236

    Coral Springs, FL 33067

    954-644-1052

    realsperity@gmail.com

    Edwin Roman Lic. Re Broker

    About the Broker

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    We are committed to the principles of Fair Housing and Equal Opportunity. All real estate services are provided without regard to race, color, religion, sex, handicap, familial status, national origin, gender identity, or sexual orientation.

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