Case Study: How We Helped Clients Win Their Property Tax Appeals
Real Examples of Residential and Commercial Success from Aaron Fox Law
At Aaron Fox Law, we’ve worked with property owners across Cook County to successfully appeal their property tax assessments. Whether it’s a small home or a large income-producing property, every case requires precision, evidence, and a deep understanding of how the Assessor and Board of Review operate.
Below are anonymized examples from residential, commercial, and exemption cases that show how I help clients reduce inflated assessments and recover money they were owed. A common thread runs through them: the Assessor agreeing with your data, or even approving an exemption, doesn’t guarantee the right number lands on your bill, which is exactly why the appeal process, the Board of Review, and a careful look at your own bill all matter.
Residential Case Study: 800 Square Feet of Error
The Situation. Our client, a homeowner in Cook County, was shocked by the property tax bill they received. Reviewing the Assessor’s data, we discovered the square footage was overstated by roughly 800 square feet, a significant error that inflated the assessed value of the home.
What We Did. We submitted documentation to the Assessor proving the actual square footage. The Assessor accepted our updated measurement and even used four of the five comparable properties (comps) we submitted in their revised analysis. Surprisingly, though, they did not change the assessed value.
The Appeal. Not satisfied with that outcome, we filed an appeal with the Cook County Board of Review. There we submitted the same comps and square footage evidence, arguing the assessment was inconsistent with the data, even using the Assessor’s own comps.
The Outcome. The Board of Review agreed with our position and significantly reduced the property’s assessed value, resulting in substantial property tax savings for the homeowner.
Commercial Case Study: Income Tells the Real Story
The Situation. A local business owner came to us about a mixed-use commercial property in Chicago with several retail units. Their assessment was far higher than anticipated, and they weren’t sure how to prove the value was lower.
What We Did. In commercial property appeals there are two main approaches, appraisal-based and income-based. While I often recommend a professional appraiser, in this case the client opted for an income approach to save on costs. We gathered:
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Profit and loss statements
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Rent rolls
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Lease agreements
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Operating expenses
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Vacancy history
That gave us a full financial profile of the property, which we used to perform an income capitalization analysis showing the property’s true market value was considerably lower than the Assessor had estimated.
The Appeal. We submitted the income analysis with a detailed narrative explaining why the Assessor’s methodology overstated the property’s worth, plus a letter outlining market rental rates and operating expenses for similar properties.
The Outcome. Based on that financial evidence and argument, the Board of Review agreed to lower the property’s assessment, resulting in thousands of dollars in annual savings for the client.
Exemption Case Study: A Granted Exemption That Quietly Fell Off
The Situation. Exemptions are some of the easiest money to lose without noticing. One client had applied for and received their exemption, then the next year it simply wasn’t there, then the year after that it came back. It had dropped off for a single random year for no clear reason. Another client applied for the Homeowner Exemption, got word from the Assessor that it was approved, and then opened their second installment bill to find it missing entirely.
What We Did. In both cases the fix was a Certificate of Error, the process for correcting a clear mistake like a missing exemption rather than disputing a judgment call on value. We documented that the exemption had been granted or qualified for and filed to have the record corrected for the affected year.
The Outcome. The exemption was restored and the client recovered the money they had overpaid for the year it was missing. These are small cases next to a large commercial appeal, but they make the same point: the system makes mistakes, and even a granted exemption can quietly fall off. It always pays to check your bill against your history every year, because a missing exemption silently inflates what you owe until someone catches it.
Why These Cases Matter
These examples show that success in property tax appeals hinges on three things:
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Accurate data, like square footage or financial records
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Strategic evidence gathering, built around comparables the Board will credit
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A deep understanding of Cook County’s appeal process, including when to escalate
Even when the Assessor agrees with your data, that doesn’t always mean your assessment will go down. That’s why persistence matters, especially when going before the Board of Review. If the Assessor’s level doesn’t get you there, it’s worth knowing your options after a denial.
One Last Tip: File on Both Grounds
There’s one more habit that runs underneath all of this: I file on both grounds, uniformity and overvaluation, not just one. Uniformity means your home is assessed higher than comparable neighbors, while overvaluation means it’s assessed above its actual market value. An analyst who reviews these appeals once told me directly that this is the right approach, because plenty of people argue only one. There are times the reviewer doesn’t see a strong basis on the angle you led with, but the other argument, had you raised it, would have given them a reason to grant the reduction. Leaving one out can quietly cost you the case.
Think You’re Overpaying? Let’s Talk.
If your assessment feels too high or you’ve found discrepancies in your file, I can help. Whether it’s a residential home or an income-producing commercial property, I know how to present your case effectively and argue for a fair assessment.
Working with an experienced Cook County property tax attorney can make all the difference when navigating this process. Contact my office to discuss your situation and what an appeal might look like for your property.
