Add Listing
    For Sale
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    Two-Story Duplex in Marathon Title is generated by Realmo AI

    329 63 Court Gulf, Marathon, FL 33050

    View on Map
    Claim this Listing
    For Sale
    $675,000

    MULTI_FAMILY - Marathon, FL

    Property size:
    1,302 SF
    Lot size:
    0.24 Acres
    Price / SF:
    $518/SF
    Added:
    Jan 22, 2026
    Days on Market:
    120
    Last Refresh:
    May 22 at 1:06 pm

    Property Features for 329 63 Court Gulf

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Other
    Zoning
    RM - Residential Medium
    Bedrooms
    2
    Bathrooms
    2
    Rooms
    Bedroom 1, Bathroom 1, Bedroom 2, Bathroom 2
    Patio and Porch features
    Patio
    Appliances
    Refrigerator, Range, Oven
    Standard status
    Active
    Size
    1,302 SF
    Lot size
    0.24 Acres

    Taxes and HOA fees

    Tax Year
    2024
    Tax Description
    Casa Blanca PB2-86 Key Vaca Lot 5 & S'LY 35' Lot 6 BK 2
    Tax Annual Amount
    5510

    Utilities

    Heating system
    Electric (Heating)
    Cooling system
    Window Unit(s), Wall/Window Unit(s)

    Building Details

    Year built
    1968
    Number of units
    2
    Building materials
    CBS
    Roof type
    Tar/Gravel

    We can help!

    Listing Contact
    Iliana Abella

    Listing agent Iliana Abella License #519307

    Listing office Compass Florida - Miami Beach 1212 Lincoln Road Suite113, Miami, FL

    Listing date Jan 22, 2026

    MLS# 618269 Listing URL

    Copyright © 2026 Florida Keys Board of REALTORS®. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • 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.
    • Includes essential appliances: Refrigerator, Range, and Oven.

    Overview

    This two-story duplex is located in Marathon, Florida. Each unit features 1 bedroom and 1 bathroom. The property is situated on a 10,591 square foot lot (0.2431 acres). The property offers redevelopment, expansion, or construction potential for a larger duplex, subject to local approvals. The location is near restaurants, Sombrero Beach, Marathon Sandbar, Florida Keys Marathon Airport, and Curry Hammock State Park. The property is zoned RM - Residential Medium. The property contains 1,302 square feet.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Ahoy taxi Moving Company

    Suggested Use

    Restaurant Real Estate Agency Law Firm Building Supply Dental Office Spa & Massage Center Big Box & Wholesale Store Auto Repair Shop Hair Salon Nail Salon

    Zoning and permitted uses should be independently verified with local authorities.

    Location Insight

    • Map
    • Local Demand
    City
    Marathon
    County
    Monroe
    State
    Florida
    Longitude
    -81.068961
    Latitude
    24.719181

    Nearby Similar for Sale

    • $1,533,333
      3,429 SF

      Marathon Commercial Property For Sale

      Commercial building with highway exposure and ample parking in Marathon.
      11401 Overseas Highway, Marathon, FL 33050
      View Details
    • $650,000
      1,040 SF

      Marathon Duplex with Redevelopment Potential

      Duplex in Marathon, Florida Keys, with redevelopment potential.
      746 50th Street Gulf, Marathon, FL 33050
      View Details
    • $920,000

      Oversized Boat Slip with Tiki

      Rare oversized boat slip in Marathon's Coco Plum Beach.
      100 Avenue I, Marathon, FL 33050
      View Details
    • $4,900,000

      Waterfront Commercial Parcels with Bay Bottom

      Rare opportunity: waterfront parcels with bay bottom rights.
      13759 Overseas Highway, MARATHON, FL 33050
      View Details
    • $4,900,000

      Waterfront Land with Bay Bottom Rights

      Rare opportunity: waterfront land with bay bottom rights in Marathon.
      13759 Overseas Highway, MARATHON, FL 33050
      View Details
    • $650,000
      1,460 SF

      Marathon Duplex Redevelopment Opportunity

      Duplex in Marathon, Florida Keys, with redevelopment potential.
      746 50th St Gulf, Marathon, FL 33050
      View Details
    • $410,000

      Live-A-Board Marina Slips

      Two adjacent marina slips for sale in Marathon, Florida.
      100 Ave I, Marathon, FL 33050
      View Details
    • $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
      View Details
    • $11,000,000
      12,198 SF

      Waterfront Residences: Luxury & Income

      Three designer homes on a waterfront parcel with income potential.
      2394 Coco Plum Drive, Marathon, FL 33050
      View Details
    • $3,549,000
      6,128 SF

      Waterfront Redevelopment Opportunity in Marathon

      Rare waterfront property with redevelopment potential and deep water dockage.
      14 125Th Street Gulf, Marathon, FL 33050
      View Details
    • $1,099,000
      1,512 SF

      Waterfront Duplex with Building Rights

      Rare duplex on canal with open water access in Marathon.
      4901/4903 49th Street, Marathon, FL 33050
      View Details
    • $1,999,999
      4,429 SF

      Corner Commercial Building with Drive-Through

      Oversized CBS building with drive-through, suitable for office or retail.
      11401 Overseas Hwy, Marathon, FL, 33050-3628
      View Details

    FAQs

    What type of property is this?
    Duplex - Two-story duplex on a large lot in Marathon, Florida.
    Where is this duplex located?
    The property is located at 329 63 Court Gulf Marathon, FL.
    What is the asking price?
    The asking price for this property is $675,000.
    What are key features of this property?
    This property features: 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.
    (305) 505-0488
    We can help!
    Listing Contact
    Iliana Abella
    Real Estate License ID: 519307
    Learn More
    Request Owner's contact information
    Message sent successfully
    Error
    If you are the owner or broker of this property and would like to edit or remove this listing please send a message to web site administrator.
    Message sent successfully
    Error
    Email to Your Friends
    Link copied to clipboard
    Separate multiple addresses with a comma
    Message sent successfully
    Error

    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
    Thanks! Your message was sent.
    Error! Your message wasn't sent.
    Please enter your name
    Please enter email
    Please enter the email in the correct format
    Please enter phone
    Please enter the number in the correct format
    Please enter message
    Thank You

    You are Unsubscribed From Notifications

    Thank You for Inquiry
    329 63 Court Gulf, Marathon, FL 33050
    letter with green check mark
    Check your email
    We sent you the
    agent's contact details. yellow underline
    Can't find it?
    Please check your junk/spam folder.
    Google sign-in failed. Please try again or use another login method.
    Sign Up Successful!
    You now have access to more from Realmo!