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    Marathon, FL
    Duplex

    Marathon, FL Duplexes for Sale

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    Key Colony Beach, FL Duck Key, FL Conch Key, FL
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    Waterfront Duplex with Dockage
    Updated: Jun 10
    Waterfront Duplex with Dockage

    303 Sombrero Beach Road, Marathon, FL 33050

    $1,549,000
    2,114 sqft · 0.25 AC lot
    Stilted full duplex in Marathon with deep‑water boating access and approximately 110 ft of concrete seawall
    2,114 SF interior living space total; each side has about 1,057 SF with 2 bedrooms and 2 bathrooms
    Private in‑ground pool with decking and low‑maintenance gravel yard
    Dockage for multiple vessels with 110 ft of dockage along the waterfront
    Each unit includes washer and dryer plus kitchen appliances (range, microwave, dishwasher, refrigerator) and disposal
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    Two-Story Duplex in Marathon
    Updated: Jan 22
    Two-Story Duplex in Marathon

    329 63 Court Gulf, Marathon, FL 33050

    $675,000
    1,302 sqft · 0.24 AC lot
    Large 10,591 SF lot ideal for redevelopment or expansion (subject to approvals).
    Prime location near Sombrero Beach, Marathon Sandbar, and other key attractions.
    Two‑story duplex offers two separate 1‑bedroom, 1‑bathroom units.
    Strong upside potential in the desirable Middle Keys.
    CBS (Concrete Block Structure) construction.
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    Waterfront Duplex with Dock/Sea Wall
    Waterfront Duplex with Dock/Sea Wall

    440-442 48th Street Ocean, Marathon, FL 33050

    $1,725,000
    2,244 sqft

    Two 3-bedroom, 2-bath units on a lot with dock/sea wall access and outdoor amenities for year-round or rental use.

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    Waterfront Duplex in Sombrero Beach
    Waterfront Duplex in Sombrero Beach

    17-18 Man-O-War Drive, Marathon, FL 33050

    $1,300,000
    1,668 sqft · 0.08 AC lot

    Updated waterfront duplex with dock and ocean access in Marathon.

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    Waterfront Duplex Near Sombrero Beach
    Waterfront Duplex Near Sombrero Beach

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

    $690,000
    834 sqft · 0.12 AC lot

    Updated waterfront duplex, move-in ready, near Sombrero Beach.

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    Waterfront Duplex with Building Rights
    Waterfront Duplex with Building Rights

    4901/4903 49th Street, Marathon, FL 33050

    $1,099,000
    1,512 sqft · 0.15 AC lot

    Rare duplex on canal with open water access in Marathon.

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    Waterfront Duplex with Dock
    Waterfront Duplex with Dock

    440-442 48th Street Ocean, Marathon, FL 33050

    $1,725,000

    Duplex with dock, pool, and short-term rental potential.

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    Based on your search, we've compiled 11 Potential Opportunities for your consideration. Besides 7 Active listings in Marathon, FL, we suggest exploring several alternatives: 4 properties in Nearby Cities

    Opportunities in Nearby Cities

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

    CBS Duplex with Direct Channel Access
    CBS Duplex with Direct Channel Access

    1433 Sunset Road, Big Pine Key, FL 33043

    $699,000
    1,924 sqft · 0.18 AC lot

    Fully furnished two-unit duplex on a large lot with full seawall and direct boating access to Bogie Channel.

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    Canal-Front Duplex with Interior Lockout
    Canal-Front Duplex with Interior Lockout

    Key Colony Beach, FL 33051

    $2,845,000
    4,478 sqft · 0.19 AC lot

    Canal-front duplex configured with an interior lockout, heated pool, and dockage for flexible residential or rental use.

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    Key Colony Duplex with Dockage
    Key Colony Duplex with Dockage

    Key Colony Beach, FL 33051

    $1,700,000
    2,040 sqft · 0.19 AC lot

    Well-maintained duplex with exceptional dockage in Key Colony Beach.

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    Income-Producing Duplex in Big Pine
    Income-Producing Duplex in Big Pine

    1433 Sunset Road, Big Pine Key, FL 33043

    $699,000
    1,924 sqft

    CBS duplex with direct boating access and large lot.

    View details

    Marathon, FL Duplexes Market Trends and Statistics

    Explore 7 duplexes for sale in Marathon, FL, showcased through 7 active listings on our real estate platform. These investment opportunities span a total of 9,674 square feet of properties for sale, with an estimated market value of $7,038,000.

    Sale prices for duplexes in Marathon, FL start at $675,000, averaging $1,173,000, and reaching up to $1,725,000 — 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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    Top Commercial Asset Segments

    Commercial property segments ranked by active listings on the market

    Short term rental properties 10
    Duplexes 7
    Apartment buildings 3
    Mobile home & RV parks 2
    Triplexes 1

    Demographics Overview

    Population 11K
    Population Growth (5Y) +12.2%
    Median Household Income $83,776
    College Educated 36.9%

    High-Yield Neighborhoods for Investment

    Identify Marathon submarkets with the highest inventory density on the market and evaluate the average listing prices of real estate assets

    Neighborhood Average Price
    33050 $1.2M

    Taxes & Financing

    Tax Rate (average for all types) 0.86%
    Property Tax per SF $8.45 per SF
    Tax Rate vs County Average 0.11 pp above county avg
    Average Loan-to-Value 65.0%

    Listings Trend

    New vs delisted commercial listings in Monroe County

    New Delisted

    Total CRE Inventory on Market (SF)

    Average Property Price per SF

    For-sale pricing trends across core commercial property types in Monroe County

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    Residential Income

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