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    711 21St St Prairie du Sac, WI 53578

    Sponsored
    For Sale
    $2,900,000

    Office - Prairie Du Sac, WI

    Type:Office
    Lot size:
    2.80 Acres
    Days on Market:
    38
    Last Refresh:
    Feb 4 at 8:06 am

    Property Features for 711 21St St

    General Information

    Property type
    Commercial Sale
    Property subtype
    Office
    Standard status
    Active
    Zoning
    Commercial
    APN
    172-0936-81510
    Parking features
    Paved or Surfaced
    Interior features
    Passenger elevator, Private Restrooms, Shared Restrooms, Reception area, Internal sprinkler
    Accessibility
    Accessible Elevator Installed
    Lot size
    2.80 Acres

    Utilities

    Heating system
    Forced Air, Zoned (Heating)
    Cooling system
    Central Air

    Building Details

    Year built
    2004
    Floors in Building
    3
    Number of units
    1
    Building materials
    Brick
    Roof type
    Composition
    Architectural style
    Other

    We can help!

    Listing Contact
    Daleen Heffron
    Daleen Heffron

    Bunbury & Assoc, REALTORS (608) 643-8525

    Listing agent Daleen Heffron (608) 643-8525

    Listing date Dec 29, 2025

    MLS# 2009708 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.

    Learn more

    Property Insight Report

    Overview

    Unique Commercial Property in Prairie

    This one-of-a-kind commercial property offers exceptional architectural character and flexibility, suitable for office, event space, or boutique hospitality use. Originally designed as the headquarters for a technology company that developed Electronic Medical Record (EMR) software, the building was envisioned as a workplace that feels like a home. Constructed to commercial specifications and inspired by a southern mansion design, the building features expansive windows, grand dual staircases, a gold chandelier, and warm indirect lighting throughout. The layout includes a full kitchen with high-end appliances, three full bathrooms, and an elevator servicing all three floors. Additional spaces include a theater room, exercise room, balconies, and two porches. Sixteen stately columns define the exterior, and a large standby generator provides added reliability. Situated on approximately 2.8 acres and currently zoned Highway Business, rezoning may be possible. The property is located in Prairie Du Sac, WI.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    American Data (Bike/Boat/Book/etc) Store

    Suggested Use

    Real Estate Agency Restaurant Law Firm Dental Office Building Supply Auto Repair Shop Gym & Fitness Center Pharmacy Skin Care Clinic Accounting Firm

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

    Location Insight

    • Map
    • Local Demand
    City
    Prairie du Sac
    County
    Sauk
    State
    Wisconsin
    Longitude
    -89.747735
    Latitude
    43.294343

    FAQs

    What type of property is this?
    Office building - Architecturally unique commercial property suitable for various uses.
    Where is this office building located?
    The property is located at 711 21St St Prairie du Sac, WI.
    What is the asking price?
    The asking price for this property is $2,900,000.
    What are key features of this property?
    This property features: - Unique architectural design inspired by a southern mansion, suitable for office, event space, or boutique hospitality.; - Commercial-grade construction with high-end features including a full kitchen, three full bathrooms, and an elevator.; - Located on approximately 2.8 acres zoned Highway Business, with potential for rezoning.
    (608) 963-6023
    Request Owner's contact information
    711 21St St Prairie du Sac, WI 53578
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    Prairie du Sac, WI 53578
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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.

    More about this property
    711 21St St Prairie du Sac, WI 53578
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    We can help!
    Listing Contact
    Daleen Heffron
    Daleen Heffron
    Real Estate License ID: 37087-90
    (608) 963-6023
    Learn more
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