5 Signs Your Commercial Property Is Over-Assessed in Cook County

Over-assessment is more common than most Cook County commercial property owners realize. Studies consistently show that **30-40% of commercial properties in Cook County are assessed above their actual market value**. Here are five signs that yours might be one of them. ## 1. Your Assessment Increased Significantly Year-Over-Year Check your assessment notice for the "mailed total" assessed value and compare it to last year's "board total." If your assessment jumped 20% or more while the local commercial real estate market has been flat or declining, that's a red flag. Cook County reassesses properties triennially, so large jumps are expected in reassessment years. But the size of the increase should be proportional to actual market conditions — not arbitrary. **What to do**: Pull your property's assessment history on the Cook County Assessor's website. If the year-over-year change exceeds local market appreciation, you likely have grounds to appeal. ## 2. Similar Properties Nearby Sold for Less Than Your Implied FMV Your "implied fair market value" is your assessed value divided by 0.25 (the Cook County Class 5 assessment level). For example: - **Assessed value**: $250,000 - **Implied FMV**: $250,000 ÷ 0.25 = **$1,000,000** Now look at recent sales of similar commercial properties in your area. If comparable buildings sold for $600,000-$800,000, the Assessor is saying your property is worth $1,000,000 — **25-67% more than the market suggests**. **What to do**: Search the Cook County Recorder of Deeds for recent commercial sales near your property. Focus on arm's-length transactions (not family transfers or foreclosures). ## 3. Your Building Has Physical or Functional Issues the Assessor May Not Know About The Assessor values properties based on data — square footage, class code, location, and market assumptions. They typically don't inspect every building. If your property has: - **Deferred maintenance** requiring significant capital investment - **Functional obsolescence** (outdated layout, poor loading access, low ceiling heights) - **Environmental issues** that reduce marketability - **High vacancy** relative to the submarket ...the Assessor's valuation may not account for these factors, leading to over-assessment. **What to do**: Document the condition issues with photos and contractor estimates. This evidence strengthens an appeal. ## 4. You're Assessed Higher Per Square Foot Than Comparable Properties This is a **uniformity argument** — the Illinois Constitution requires that similar properties be assessed similarly. If your property is assessed at $40 per square foot but comparable non-sold commercial properties in the same township are assessed at $25-$30 per square foot, that's an inequity. This is a separate argument from market value — you're not saying the Assessor's value is wrong, you're saying it's unfairly high compared to similar properties. **What to do**: Look up the assessments of 5-10 similar commercial properties in your township on the Cook County Assessor's website. Calculate their AV per square foot and compare to yours. ## 5. Your Actual NOI Doesn't Support the Assessor's Valuation If your property generates $80,000 in Net Operating Income and appropriate cap rates for your property type are 8-9%, the income-indicated FMV is $889,000-$1,000,000. If the Assessor has your property valued at $1,500,000 (assessed at $375,000), their valuation implies NOI of $120,000-$142,500 at those cap rates — **50-78% more than your actual income**. **What to do**: Prepare a T-12 (trailing 12-month) income and expense statement. This is the strongest evidence for income-producing properties because it uses your actual numbers, not the Assessor's estimates. ## What to Do If You See These Signs If one or more of these signs apply to your property, you should file an appeal. In Cook County: - **There is no risk** — your assessment cannot be raised as a result of an appeal - **Filing is free** at the Assessor level - **You don't need a lawyer** for Assessor-level appeals - **The deadline matters** — filing windows are approximately 30 days per township ## Let TaxRival Check for You Not sure if your property qualifies? Enter your 14-digit PIN on our homepage and we'll instantly compare your assessment against market data. If you're over-assessed, we'll show you by how much — and offer to file the appeal for you at 25% of savings (only if we succeed).