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    Key West, FL
    Duplex

    Key West, FL Duplexes for Sale

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    Stock Island, FL Summerland Key, FL Big Pine Key, FL Cudjoe Key, FL
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    Duplex with Unfinished Third Floor
    Updated: Sep 23
    Duplex with Unfinished Third Floor

    646 William Street, Key West, FL 33040

    $1,400,000
    1,780 sqft 0.09 AC lot
    Two‑and‑a‑half‑story duplex with 1,780 square feet
    Four finished bedrooms and three bathrooms
    Unfinished third floor is not configured as living space
    0.09‑acre property zoned HHDR - Historic High Dens
    Built in 1928; frame construction with metal roof
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    Renovated Duplex
    Updated: Jun 22
    Renovated Duplex

    1126 Grinnell Street, Key West, FL 33040

    $1,195,000
    875 sqft 0.03 AC lot
    Two 1‑bedroom, 1‑bath residences in an 875‑square‑foot duplex
    Renovated interiors with European‑style kitchens and stainless steel appliances
    0.03‑acre parcel with private yard space and a deck
    Built in 1929; frame construction with a metal roof
    HNC(1‑3) - Hist Nghborhd zoning
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    Duplex with Private Pool
    Duplex with Private Pool

    1516 17th Terrace, Key West, FL 33040

    $1,875,000
    2,423 sqft 0.30 AC lot

    Corner duplex with a detached guest cottage, fenced grounds, covered parking, and a private pool.

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    Waterfront Duplex with Bonus Suite
    Waterfront Duplex with Bonus Suite

    Key West, FL 33040

    $2,499,999
    3,568 sqft

    Self-contained residences offer private entrances, kitchens, laundry areas, and air-conditioning systems for flexible occupancy arrangements.

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    2-Unit Duplex
    2-Unit Duplex

    1300 Ashby St, Key West, FL 33040

    $1,350,000
    1,760 sqft

    Two distinct living spaces offer residential flexibility, with window-unit cooling and vinyl flooring.

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    Key West Duplex with Redevelopment Rights
    Key West Duplex with Redevelopment Rights

    3711 Eagle Avenue, Key West, FL 33040

    $825,000
    1,464 sqft 0.14 AC lot

    CBS construction, a metal roof, and off-street parking serve this residential property near schools, shopping, beaches, and Old Town.

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    Corner Duplex Lot with Cottage
    Corner Duplex Lot with Cottage

    2330 Staples Avenue, Key West, FL 33040

    $999,000
    693 sqft 0.15 AC lot

    Corner lot with a cottage and alley access, plus a demolished second unit ready for new construction.

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    Updated Two-Unit Duplex
    Updated Two-Unit Duplex

    1300 Ashby Street, Key West, FL 33040

    $1,350,000
    1,760 sqft 0.15 AC lot

    Updated duplex with separate living spaces and SF-1 zoning in Midtown.

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    Updated Two-Unit Duplex
    Updated Two-Unit Duplex

    1911 Seidenberg Avenue, Key West, FL 33040

    $1,250,000
    1,119 sqft 0.12 AC lot

    Legal duplex with separate metering, screened porches, off-street parking, and updated interiors in Key West.

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    Duplex with Studio Cottage
    Duplex with Studio Cottage

    2004 Patterson Avenue, Key West, FL 33040

    $899,000
    1,239 sqft 0.12 AC lot

    Two separate residences combine a primary home with a flexible studio cottage configuration.

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    Oceanfront Duplex Property
    Oceanfront Duplex Property

    1430 Vernon Avenue, Key West, FL 33040

    $9,888,000
    2,071 sqft 0.20 AC lot

    Two-story property with HCT zoning, separate electric meters, and direct ocean frontage.

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    Four-Unit Multifamily Property
    Four-Unit Multifamily Property

    Key West, FL 33040

    $2,000,000
    0.05 AC lot

    Four individually licensed residences with separate utility metering, laundry rooms, and covered front porches.

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    Based on your search, we've compiled 16 Potential Opportunities for your consideration. Besides 12 Active listings in Key West, 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.

    Waterfront Duplex with Seawall
    Waterfront Duplex with Seawall

    3962-3964 No Name Road, Big Pine Key, FL 33043

    $925,000
    1,536 sqft 0.17 AC lot

    Two separately metered residences provide private laundry areas, central air, covered porches, and fenced outdoor space.

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    Waterfront Duplex with Private Dock
    Waterfront Duplex with Private Dock

    241 Sombrero Beach Road, Marathon, FL 33050

    $1,400,000
    1,840 sqft 0.17 AC lot

    Waterfront duplex with direct ocean access, a private pool, and fenced outdoor space.

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    Waterfront Duplex with Pool
    Waterfront Duplex with Pool

    303 Sombrero Beach Road, Marathon, FL 33050

    $1,549,000
    2,114 sqft 0.25 AC lot

    Stilted two-unit property with a private pool, dockage, garages, and water views.

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    Waterfront Duplex with Buildable Lot
    Waterfront Duplex with Buildable Lot

    Big Pine Key, FL 33043

    $1,099,000
    1,888 sqft 0.33 AC lot

    Duplex property offers direct waterfront access plus an additional buildable vacant lot on deep, clean canals.

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    Key West, FL Duplexes Market Trends and Statistics

    Explore 12 duplexes for sale in Key West, FL, showcased through 12 active listings on our real estate platform. These investment opportunities span a total of 18,752 square feet of properties for sale, with an estimated market value of $25,530,999.

    Sale prices for two-family homes in Key West, FL start at $825,000, averaging $2,127,583, and reaching up to $9,888,000 — 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

    Duplexes 12
    Apartment buildings 8
    Short term rental properties 7
    Quadplexes 4
    Triplexes 2

    Demographics Overview

    Population 36K
    Population Growth (5Y) +3.8%
    Median Household Income $79,038
    College Educated 17.6%

    High-Yield Neighborhoods for Investment

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

    Neighborhood Average Price
    33040 $2M

    Taxes & Financing

    Tax Rate (average for all types) 0.71%
    Property Tax per SF $10.90 per SF
    Tax Rate vs County Average 0.03 pp below 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 Residential Income pricing trends in Monroe County

    Residential Income

    How Realmo verifies these figures

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    Browse Duplexes for Sale Near Key West, FL

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    Most Searched ZIP Codes in Key West, FL

    • 33040

    Featured Key West Real Estate Agencies

    Realmo connects you with licensed Key West CRE brokers providing property specifications, local market pricing, and commercial transaction underwriting support.

    Berkshire Hathaway Keys Real Estate | Knight & Gardner Realty
    336 Duval St Key West, FL 33040
    Phone: 13052945155
    www.keysrealestate.com
    Truman & Co. Real Estate Services
    1205 Truman Avenue Key West, FL 33040
    Phone: 13052922244
    www.trumanandcompany.com
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