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    Marathon, FL Duplexes for Sale

    9 results
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    Marathon Duplex Redevelopment Opportunity
    $650,000
    1,460 SF

    Marathon Duplex Redevelopment Opportunity

    746 50th St Gulf, Marathon, FL 33050

    Duplex in Marathon, Florida Keys, with redevelopment potential.

    • Rare redevelopment opportunity in the heart of Marathon, Florida Keys.
    • Desirable lot location.
    • Duplex property with two separate units.
    • Each unit features 1‑bedroom and 1‑bath.
    • Includes a garage.
    Updated: Mar 29
    View details
    Waterfront Duplex Near Sombrero Beach
    $770,000
    834 SF

    Waterfront Duplex Near Sombrero Beach

    17 Man-O-War Drive, Marathon, FL 33050

    Updated waterfront duplex near Sombrero Beach, ideal for rental income.

    • Waterfront property with new 45‑ft dock and new seawall.
    • Short walking distance to Sombrero Beach.
    • Priced below appraised value.
    • Newly updated with new vinyl plank flooring, tiled shower, updated kitchen, and newer appliances.
    • Freshly painted inside and out; move‑in ready.
    Updated: Mar 31
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    Multifamily Complex in Marathon, Florida
    $1,800,000
    3,017 SF

    Multifamily Complex in Marathon, Florida

    Multifamily complex with redevelopment potential in a high-demand location.

    13755 Overseas Highway, Marathon, FL 33050
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    Waterfront Duplex Near Sombrero Beach
    $770,000
    834 SF

    Waterfront Duplex Near Sombrero Beach

    Updated half-duplex with new dock and open-water views.

    18 Man-O-War Drive, Marathon, FL 33050
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    Charming Duplex in Little Venice
    $699,000
    907 SF

    Charming Duplex in Little Venice

    Versatile duplex in Marathon, Florida Keys, ideal for living/investment.

    487 116th Street, Marathon, FL 33050
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    Waterfront Duplex in Sombrero Beach
    $1,400,000
    1,668 SF

    Waterfront Duplex in Sombrero Beach

    Updated waterfront duplex with dock and ocean access in Marathon, FL.

    17-18 Man-O-War Drive, Marathon, FL 33050
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    Two-Story Duplex in Marathon
    $675,000
    1,302 SF

    Two-Story Duplex in Marathon

    Two-story duplex in Marathon, ideal for redevelopment and expansion.

    329 63 Court Gulf Court, Marathon, FL 33050
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    Waterfront Duplex in Marathon, Florida
    $1,099,000
    1,512 SF

    Waterfront Duplex in Marathon, Florida

    Duplex with canal access, ideal for rental income or residence.

    4901/4903 49th Street, Marathon, FL 33050
    View details
    Ocean View Duplex in Marathon
    $1,500,000
    1,590 SF

    Ocean View Duplex in Marathon

    Remodeled duplex with ocean views and direct ocean access.

    945 98Th Street, Marathon, FL 33050
    View details
    Based on your search, we've compiled 17 Potential Opportunities for your consideration. Besides 9 Active listings in Marathon, FL, we suggest exploring several alternatives: 4 properties in Nearby Cities, plus 4 Land Listings that present a potential for development.

    Explore Opportunities in Nearby Cities

    Here are 4 Similar properties we found in Nearby Locations for your consideration.

    Key West Duplex on Large Lot
    $1,250,000
    2,664 SF

    Key West Duplex on Large Lot

    Legal duplex on a spacious corner lot in Key West.

    1409 4Th Street, Key West, FL 33040
    View details
    Updated Duplex Near Harry Harris
    $799,000
    1,496 SF

    Updated Duplex Near Harry Harris

    Legal duplex near oceanfront park, updated with modern amenities.

    102 Harry Harris Drive, Key Largo, FL 33070
    View details
    Key West Duplex Lot Opportunity
    $899,000

    Key West Duplex Lot Opportunity

    Spacious corner duplex lot with development potential in Key West.

    2330 Staples Avenue, Key West, FL 33040
    View details
    Oceanfront Multifamily with Rental Potential
    $2,345,000
    1,716 SF

    Oceanfront Multifamily with Rental Potential

    Oceanfront multifamily property with deepwater dockage and nightly rental approval.

    127 Seaside Avenue, Key Largo, FL 33037
    View details

    Potential Development Sites for Consideration

    Can't find the perfect fit? These Land listings present an alternative path: the potential to develop a property for your specific goals.

    Important: These AI-suggestions are a starting point, not a guarantee of permitted use. All zoning, permitting, and land use information must be independently verified by you with the appropriate local authorities before making any commitments.

    Gulf Front Estate in Marathon
    $9,950,000

    Gulf Front Estate in Marathon

    3.86-acre mixed-use commercial property with waterfront and highway frontage.

    6500-6600 Overseas Highway, Marathon, FL 33050
    View details
    Highway Frontage Development Opportunity
    $3,450,000

    Highway Frontage Development Opportunity

    Prime commercial land with highway frontage and ocean access.

    8501 Overseas Highway, Marathon, FL 33050
    View details
    Commercially Zoned Parcel on A1A
    Contact for pricing

    Commercially Zoned Parcel on A1A

    0.556±AC commercially zoned parcel with frontage to FL SR A1A.

    5994 Overseas Hwy, Marathon, FL 33050
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    Oceanfront Lot on Overseas Highway
    $265,000
    0.34 Acres

    Oceanfront Lot on Overseas Highway

    Buildable oceanfront lot in Marathon, Florida with multiple uses.

    Overseas Highway Over Hwy, Marathon, FL 33050
    View details

    Marathon, FL Duplexes Investment Opportunities Market Analysis

    Explore 9 duplexes for sale in Marathon, FL, showcased through 9 active listings on our real estate platform. These investment opportunities span a total of 3,502,263,640 square feet of properties for sale, with an estimated market value of $8,664,000.

    Sale prices for duplexes in Marathon, FL start at $650,000, averaging $1,083,000, and reaching up to $1,800,000 — offering options for a variety of budgets and business needs. Daily updated analytics ensure you stay ahead with the latest data and market trends.

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    Browse Duplexes for Sale Near Marathon, FL

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