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    Spacious Duplex in Sparta, WI Title is generated by Realmo AI

    901-903 Boldon Avenue, Sparta, WI 54656

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    For Sale
    $575,000

    Duplex-side by side,1 story - Sparta, WI

    Lot size:
    0.29 Acres
    Added:
    Mar 24, 2026
    Days on Market:
    75
    Last Refresh:
    Jun 6 at 7:06 am

    Property Features for 901-903 Boldon Avenue

    General Information

    Property type
    Residential Multi Family
    Property subtype
    Other
    Zoning
    G1-Res
    Bedrooms
    8
    Rooms
    Basement, Bedroom 1, Bedroom 2, Bedroom 3, Bedroom 4, Bedroom 5
    Parking
    4
    Parking features
    Garage
    Basement Y/N
    1
    Appliances
    Dishwasher, Dryer
    Standard status
    Active
    APN
    281-02587-6221
    Lot size
    0.29 Acres

    Taxes and HOA fees

    Tax Year
    2025
    Tax Annual Amount
    8114

    Utilities

    Heating system
    Forced Air

    Building Details

    Year built
    2007
    Floors in Building
    1
    Number of units
    2
    Building materials
    Brick
    Architectural style
    Other

    We can help!

    Listing Contact
    Dan Macklin

    Listing agent Dan Macklin

    Listing office Castle Rock Realty LLC 104 W State St. (CC), Mauston, WI

    Listing date Mar 24, 2026

    MLS# 2019126 Listing URL

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

    HighLights

    • High‑occupancy rental potential with long‑term tenants already in place.
    • Finished lower level featuring a recreation room, fireplace, 2 bedrooms with egress windows, and full bath.
    • Spacious, open‑concept layout.
    • 4 bedrooms and 3 bathrooms per unit.
    • Primary suite with walk‑in closet and private bath.
    • Attached 2‑car garage.

    Overview

    This side-by-side duplex in Sparta, WI, features a spacious, open-concept layout in each unit, seamlessly connecting the living, dining, and kitchen areas. Each main floor includes two bedrooms and two bathrooms, with a primary suite featuring a walk-in closet and private bath, as well as a laundry room. The finished lower level of each unit adds a large recreation room with a fireplace, two additional bedrooms with egress windows, a full bath, and a generous storage area. Each unit also has an attached 2-car garage. With 4 bedrooms and 3 baths per side, this duplex is positioned for high-occupancy rentals. Long-term tenants are already in place.
    Property Profile Location Intelligence

    Current Use by Public Records

    Duplexes

    Map

    City
    Sparta
    County
    Monroe
    State
    Wisconsin
    Longitude
    -90.847312
    Latitude
    43.934369

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    FAQs

    What type of property is this?
    Duplex - Side-by-side duplex with long-term tenants, ideal for high-occupancy rentals.
    Where is this duplex located?
    The property is located at 901-903 Boldon Avenue Sparta, WI.
    What is the asking price?
    The asking price for this property is $575,000.
    What are key features of this property?
    This property features: High‑occupancy rental potential with long‑term tenants already in place.; Finished lower level featuring a recreation room, fireplace, 2 bedrooms with egress windows, and full bath.; Spacious, open‑concept layout.
    (608) 344-8044
    We can help!
    Listing Contact
    Dan Macklin
    Real Estate License ID: 95838-94
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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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