Add Listing
    Property Lookup
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    1521 Williamson St Madison, WI 53703-3768
    Back to Search
    Property profile & analytics

    1521 Williamson St, Madison, WI 53703-3768

    View on Map
    • Investment properties
    • 1,225 SF
    • 0.07 lot acres
    Off-Market
    Last Sale Jun 29, 2025
    $580,000
    Property ID
    US92-0562826
    The Realmo ID is a unique identifier assigned to every property, incorporating country codes and precise geo-coordinates for 300x300-foot land blocks. It enables standardized data collection and seamless integration of disparate sources such as ownership, tax, title data and physical specifications. By aggregating current and historical records, the Realmo ID powers advanced analytics and delivers deep, verifiable insights for real estate professionals.
    Value Estimations
    Cap Rate Potential
    Location Intelligence

    Current Use by Public Records

    • Stillgood's / Discount Store / (Bike/Boat/Book/etc) Store
    • Hans' Sewing Machine Repair / General Contractor

    Property Details for 1521 Williamson St

    Year built
    1911
    Lot size
    0.07 lot acres
    Zone code
    HIS-TL NMX
    Property type
    Investment properties
    Property subtype
    Live-work space
    APN
    0710-072-1602-3
    APU
    71007216023

    Value Estimations

    based on Realmo’s proprietary methodology

    • AI approach

    • CAP approach

    • Comparable approach

    • Alternative Use

    Get a detailed, property-specific estimation — fast and free

    Location Insight

    • Map
    • Local Demand
    City
    Madison
    County
    Dane
    State
    Wisconsin
    Longitude
    -89.3585
    Latitude
    43.0875
    CBSA code
    31540
    CBSA name
    MADISON, WI METROPOLITAN STATISTICAL AREA

    Property Tax & Assessments

    Tax date
    Tax Amount
    Assessed Land Value
    Assessed Improvement Value
    Total Assessed Value
    Applied Tax Rate
    Land Market Value
    Improvement Market Value
    Total Market Value
    2022
    $6,459
    $40,000
    $315,000
    $355,000
    -
    $0.00
    $0.00
    $0.00

    Comparable in this City

    • Value Estimation
      $1,195,000
      5,474 SF

      123 Mifflin St

      OFFICE/RESIDENTIAL (MIXED USE)
      123 Mifflin St, Madison, WI 53703-2807
      View Details
    • Value Estimation
      $765,000
      3,471 SF

      202 Gorham St

      OFFICE/RESIDENTIAL (MIXED USE)
      202 Gorham St, Madison, WI 53703-2015
      View Details
    • Value Estimation by Request
      2,684 SF

      1251 Williamson St

      OFFICE/RESIDENTIAL (MIXED USE)
      1251 Williamson St, Madison, WI 53703-3754
      View Details
    • Value Estimation
      $625,000
      3,796 SF

      522 Wilson St

      OFFICE/RESIDENTIAL (MIXED USE)
      522 Wilson St, Madison, WI 53703-3431
      View Details
    • Value Estimation by Request
      1,328 SF

      1236 Williamson St

      OFFICE/RESIDENTIAL (MIXED USE)
      1236 Williamson St, Madison, WI 53703-3755
      View Details
    • Value Estimation by Request
      888 SF

      1035 Williamson St

      OFFICE/RESIDENTIAL (MIXED USE)
      1035 Williamson St, Madison, WI 53703-3525
      View Details

    Similar Nearby for Sale

    • $1,850,000
      3,761 SF

      Downtown Madison Storefront Investment

      Prime Retail & Apartment Opportunity
      115 Main St, Madison, WI 53703
      View Details
    • Contact for pricing
      3,761 SF

      Downtown Investment Property For Sale

      Fully furnished restaurant with luxury apartment near Capital Square.
      115 E Main St, Madison, WI 53703
      View Details
    • Contact for pricing
      3,564 SF

      Mixed-Use Property with Restaurant

      Mixed-use property with residential units and established restaurant for sale.
      1054 Williamson St, Madison, WI 53703
      View Details
    • Contact for pricing

      Historic Willy Street Commercial Building

      Mixed-use building on Willy Street with office and residential spaces.
      1053 Williamson St, Madison, WI 53703
      View Details
    • Contact for pricing
      5,400 SF

      212 W Gorham St, Madison, WI 53703

      Mixed-use properties
      212 W Gorham St, Madison, WI 53703
      View Details
    • $250,000
      0.10 Acres

      Willy Street Land Opportunity

      Deep lot with possibilities on Willy Street in Madison.
      929 Williamson St, Madison, WI 53703
      View Details

    Similar Nearby for Lease

    • Contact for pricing

      Downtown Madison Premier Office Space

      Modern office space with amenities in Downtown Madison.
      305 W Johnson St, Madison, WI 53703
      View Details
    • $110,925

      Versatile Commercial Space in Madison

      Expansive mixed-use property with office, retail, and warehouse potential.
      1342 Dewey Ct, Madison, WI 53703
      View Details
    • Contact for pricing

      Capitol Square Mixed-Use Building

      Three-story mixed-use building with restaurant and office space.
      12 W Mifflin St, Madison, WI 53703
      View Details
    • Contact for pricing

      Office Space with Lake Views

      Office space for rent with lake views and parking.
      44 E Mifflin St, Madison, WI 53703
      View Details
    • Contact for pricing
      1,923 SF

      Downtown Madison Renovated Office Space

      Modern, renovated office space in downtown Madison near Capitol Square.
      316 W Washington Ave, Madison, WI 53703
      View Details
    • Contact for pricing
      1,418 SF

      Hovde Building Office Space

      Office space in restored building near Capitol Square.
      122 W Washington Ave, Madison, WI 53703
      View Details
    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.
    1521 Williamson St
    Madison, WI 53703-3768
    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
    1521 Williamson St, Madison, WI, 53703
    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!