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    South City Duplex Investment Opportunity Title is generated by Realmo AI

    4931 Mardel Avenue St, Louis, MO 63109

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    For Sale
    $279,900

    Colonial, 2-4 Units - St Louis, MO

    Property size:
    2,268 SF
    Lot size:
    0.09 Acres
    Price / SF:
    $123/SF
    Added:
    Apr 21, 2026
    Days on Market:
    31
    Last Refresh:
    May 21 at 4:06 pm

    Property Features for 4931 Mardel Avenue St

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Other
    Rooms
    Basement
    Parking features
    Garage, On Street
    Security features
    Security System, Security System Owned
    Interior features
    Ceiling Fan(s), High Speed Internet, Tub
    Exterior features
    Balcony, Private Entrance
    Basement Y/N
    1
    Appliances
    Dishwasher, Microwave, Range, Refrigerator, Washer
    Standard status
    Active
    APN
    6031-00-0410-0
    Size
    2,268 SF
    Lot size
    0.09 Acres

    Taxes and HOA fees

    Tax Year
    2024
    Tax Annual Amount
    2873

    Utilities

    Heating system
    Electric (Heating)
    Cooling system
    Central Air

    Building Details

    Year built
    1927
    Floors in Building
    2
    Number of units
    2
    Flooring type
    Vinyl
    Building materials
    Brick, Vinyl Siding
    Architectural style
    Colonial

    We can help!

    Listing Contact
    Heather Reeves

    Listing agent Heather Reeves License #2022015065

    Listing office RE/MAX Results 4850 Lemay Ferry Rd Ste 100, Saint Louis, MO

    Listing date Apr 21, 2026

    MLS# 26008116 Listing URL

    Copyright © 2026 Mid America Regional Information Systems, Inc. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • Duplex with immediate rental income from tenant‑occupied Unit B.
    • Vacant, furnished Unit A available for immediate occupancy or showings.
    • Strong investment or owner‑occupant potential in South City location.
    • Convenient location near shopping, dining, parks, and major highways.
    • Classic brick exterior with separate private entrances and solid curb appeal.
    • Each unit features abundant natural light and comfortable living spaces.

    Overview

    This South City duplex presents a strong investment or owner-occupant opportunity. The property features a classic brick exterior with separate private entrances and solid curb appeal. Unit A is vacant and furnished, ready for showings, while Unit B is tenant-occupied, providing immediate rental income. Each unit benefits from abundant natural light and comfortable living and dining spaces. The property is conveniently located near shopping, dining, parks, and major highways. Situated on a lot of 0.0882 acres, the building has a total area of 2268 square feet.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Duplexes

    Map

    City
    Louis
    County
    St. Louis
    State
    Missouri
    Longitude
    -90.27368
    Latitude
    38.59299

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    FAQs

    What type of property is this?
    Duplex - St. Louis duplex with investment or owner-occupant potential.
    Where is this duplex located?
    The property is located at 4931 Mardel Avenue St Louis, MO.
    What is the asking price?
    The asking price for this property is $279,900.
    What are key features of this property?
    This property features: Duplex with immediate rental income from tenant‑occupied Unit B.; **Vacant, furnished Unit A available for immediate occupancy or showings.**; Strong investment or owner‑occupant potential in South City location.
    (636) 215-0338
    We can help!
    Listing Contact
    Heather Reeves
    Real Estate License ID: 2022015065
    Learn More
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    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.

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