Sign Up Successful!
You now have access to more from Realmo!
Property Lookup
    Property Lookup
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    AI Search
    Back to Search
    The Largest CRE Database in the US with Over 1 Million Listings
    Property profile & analytics

    1521 Williamson St Madison, WI 53703-3768

    • Investment properties
    • 1,225 SF
    • 0.07 lot acres
    OFF-MARKET
    Last Sale
    Jun 29, 2025
    $580,000
    Value Estimations
    Cap Rate Potential
    Location Intelligence
    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.

    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
    Property size
    1,225 SF
    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 valuation — 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
      $620,000
      1.82 Acres

      339 Gorham St

      OFFICE/RESIDENTIAL (MIXED USE) • 1.82 Acres
      339 Gorham St, Madison, WI 53703
      View Details
    • Value Estimation
      $675,000
      0.60 Acres

      408 Washington Ave

      OFFICE/RESIDENTIAL (MIXED USE) • 0.60 Acres
      408 Washington Ave, Madison, WI 53703-3070
      View Details
    • Value Estimation by Request
      300 SF

      1216 Williamson St

      OFFICE/RESIDENTIAL (MIXED USE) • 300 SF
      1216 Williamson St, Madison, WI 53703-3755
      View Details
    • Value Estimation
      $1,380,000
      8,174 SF

      315 Wisconsin Ave

      OFFICE/RESIDENTIAL (MIXED USE) • 8,174 SF
      315 Wisconsin Ave, Madison, WI 53703-2107
      View Details
    • Value Estimation
      $800,000
      4,347 SF

      319 Frances St

      OFFICE/RESIDENTIAL (MIXED USE) • 4,347 SF
      319 Frances St, Madison, WI 53703-1970
      View Details
    • Value Estimation
      $26,445,000
      157,170 SF

      2 Gilman St

      OFFICE/RESIDENTIAL (MIXED USE) • 157,170 SF
      2 Gilman St, Madison, WI 53703-1479
      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
    • $1,850,000
      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
    • $1,500,000
      5,400 SF

      Historic King House, Madison WI

      Mixed-use investment; prime downtown location.
      212 Gorham St, Madison, WI 53703
      View Details
    • $1,500,000

      Historic Willy Street Commercial Building

      Mixed-use building on Willy Street with office and residential spaces.
      1053 Williamson St, Madison, WI 53703
      View Details
    • $1,700,000
      3,080 SF

      King Street Retail Investment

      Madison Mixed-Use Building, High ROI
      106 King St, Madison, WI 53703
      View Details
    • $2,200,000
      6,237 SF

      Renovated Single Tenant Office Building

      6,158 SF office building, renovated in 2020, long-term tenant.
      210 S Dickinson St, Madison, WI 53703
      View Details

    Similar Nearby for Lease

    • $31 SF/Yr
      14,534 SF

      State Street Retail Opportunity

      Madison Mixed-Use, 2,900 SF Available
      311-315 State St, Madison, WI 53703
      View Details
    • $17 SF/Yr
      2,381 SF

      Capitol Square Office Space Available

      Third-floor office space near Capitol Square with historic character.
      119-123 E Main St, Madison, WI 53703
      View Details
    • $17 SF/Yr
      2,929 SF

      Historic Willy Street Office Space

      Renovated office space in historic landmark building for lease.
      744 Williamson St, Madison, WI 53703
      View Details
    • Contact for pricing
      6,460 SF

      Office Space with Open Workspace

      Office space featuring conference rooms, kitchen, and open workspace.
      1 S Pinckney St, Madison, WI 53703
      View Details
    • $28 SF/Yr
      1,592 SF

      Historic Office Building in Madison

      Landmark office building in the Cap East District for rent.
      301 S Blount St, Madison, WI 53703
      View Details
    • $32 SF/Yr
      5,108 SF

      Class A Office Space Available

      Premier office building with lake views in downtown Madison.
      150 E Gilman St, 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

    Google sign-in failed. Please try again or use another login method.