Reading about property tax appeals in the abstract is one thing. Seeing exactly what a successful appeal looks like — step by step, document by document, dollar by dollar — is something else entirely. This case study walks through a realistic Logan Square appeal from the moment the Notice of Proposed Assessment arrived to the outcome nine weeks later. Every detail reflects how real appeals work. The property and owner are illustrative, but the process, the math, and the timeline are drawn from actual Cook County appeal experience.
The Property
Detail | Information |
|---|---|
Property Type | 2-bedroom / 2-bathroom condominium |
Neighborhood | Logan Square, Chicago |
Square Footage | 1,150 square feet above grade |
Purchase Price | $480,000 (closed October 2023) |
Assessor's Implied Market Value | $550,000 (based on 2024 reassessment) |
Assessor's Assessed Value (AV) | $55,000 (10% of $550,000) |
Owner-Occupied? | Yes — Homeowner Exemption applied |
The Starting Point: Calculating the Tax Exposure
When the Notice of Proposed Assessment arrived in May 2024, the owner — let us call her Maria — did what most homeowners do: she looked at the number, felt a knot in her stomach, and set the letter on the counter. A week later, she pulled it back out and did the math.
Maria had purchased the condo in October 2023 for $480,000. The notice showed an Assessed Value of $55,000 — implying the Assessor believed the condo was worth $550,000. That was $70,000 more than she had paid seven months earlier, in a market transaction that was fully arm's-length. She had a sense that something was off.
Here is the tax calculation at the Assessor's proposed value:
Assessor's Proposed Assessment — Estimated Annual Tax
Assessed Value (AV): $55,000
Equalized Assessed Value (EAV) at ×2.9: $159,500
Minus Homeowner Exemption: −$10,000
Net EAV: $149,500
Estimated tax rate (Logan Square): 7.8%
Estimated Annual Tax Bill: $11,661
Nearly $12,000 per year in property taxes — roughly $972 per month on top of her mortgage payment — for a condo she had purchased at $480,000. Maria decided to investigate further.
Step 1: Check the Property Record Card
Maria went to cookcountyassessor.com and looked up her PIN — the 14-digit number on the notice. She pulled the property record card and reviewed every field.
The record card showed 1,150 square feet — accurate. Two bedrooms and two bathrooms — accurate. In-unit laundry — not on the record card, but this was a positive amenity, not something to challenge. No garage — accurate (the building had no included parking). Year built: 2006. Quality rating: B. These all looked right.
No obvious property record errors. That meant the argument would be a market value argument — the Assessor's estimated value was higher than what the evidence supported.
Step 2: Pull Comparable Sales
Maria reached out to her real estate agent — the same agent who had represented her in the purchase — and asked for a CMA (Comparative Market Analysis) focused on 2-bed/2-bath condos in Logan Square that had closed within the past 12 months. The agent pulled five strong comparables from the MLS.
Comparable | Sq Ft | Beds/Baths | Sale Date | Sale Price |
|---|---|---|---|---|
Logan Square — Comp 1 | 1,100 sq ft | 2 bed / 2 bath | Jan 2024 | $465,000 |
Logan Square — Comp 2 | 1,200 sq ft | 2 bed / 2 bath | Feb 2024 | $498,000 |
Logan Square — Comp 3 | 1,050 sq ft | 2 bed / 2 bath | Oct 2023 | $460,000 |
Logan Square — Comp 4 | 1,175 sq ft | 2 bed / 2 bath | Nov 2023 | $485,000 |
Logan Square — Comp 5 (Maria's own purchase) | 1,150 sq ft | 2 bed / 2 bath | Oct 2023 | $480,000 |
The five comparable sales ranged from $460,000 to $498,000, with an average of approximately $478,000. Not a single comparable supported a $550,000 value. The Assessor's implied market value was roughly $70,000 — nearly 15% — above what the evidence supported.
More importantly, Maria's own purchase was one of the comparables. She had paid $480,000 in an arm's-length transaction seven months before the notice. That purchase price is generally considered the single strongest indicator of market value, and it was $70,000 below the Assessor's figure.
Step 3: Determine the Target Assessment
Maria decided to request an assessed value based on a $480,000 market value — her actual purchase price, which was well-supported by the comparable sales:
Maria's Requested Assessment
Target Market Value: $480,000
Target Assessed Value (AV) at 10%: $48,000
Reduction requested: $55,000 → $48,000 (a $7,000 AV reduction)
Step 4: Prepare and File the Appeal
The notice was dated May 10, 2024. Maria had until June 9, 2024 to file her Assessor appeal. She filed online on May 24 — two weeks after receiving the notice, giving her time to gather evidence without cutting it close.
What Maria Submitted
Maria assembled her appeal submission with the following documents:
☐ Completed appeal form (generated by assessor.cookcountyil.gov portal)
☐ Comparable sales grid with all five properties, completed in the format required by the portal
☐ MLS printouts for each of the four external comparables, showing sale price, date, square footage, and address
☐ Copy of her ALTA settlement statement showing purchase price of $480,000 and closing date of October 17, 2023
☐ Copy of the fully executed purchase contract confirming the $480,000 sale price
☐ Brief cover memo (one page) summarizing the argument: five comparable sales averaging $478,000 support a market value of $480,000, not $550,000; her own arm's-length purchase 7 months prior was at $480,000
The whole assembly took about two hours. She submitted online, received a confirmation email, and waited.
Step 5: The Wait
One of the most common frustrations with the appeal process is the waiting. Maria filed on May 24. The Assessor's decision arrived on August 2 — about 10 weeks later. During that time, she received no correspondence, no status update, and no indication of what was happening. This is completely normal. The Assessor processes tens of thousands of appeals and decisions come out in batches.
The decision can also be checked online via the Assessor's portal using the appeal confirmation number. Maria checked it about once a week after the first month.
Step 6: The Decision
On August 2, Maria received a decision letter in the mail. The Assessor had accepted her appeal in part and reduced her assessed value — but not all the way to her requested $48,000. The Assessor reduced the AV to $48,000 — the full amount she had requested. This was the best possible outcome at the Assessor level.
Assessor's Decision — New Assessment
New Assessed Value (AV): $48,000 (down from $55,000)
New Implied Market Value: $480,000 (AV ÷ 0.10)
New EAV at ×2.9: $139,200
Minus Homeowner Exemption: −$10,000
Net EAV: $129,200
Estimated tax rate: 7.8%
New Estimated Annual Tax Bill: $10,078
The Financial Outcome
$1,583 Annual Savings $11,661 (before appeal) minus $10,078 (after appeal) = $1,583 per year in reduced property taxes. | $132 Monthly Savings $1,583 ÷ 12 months = approximately $132 per month reduction in the effective housing cost. | ~2 hrs Time Invested Total time spent: approximately 2 hours pulling evidence, preparing the submission, and filing online. |
The savings persist until the next reassessment year for Chicago — 2027 — at which point Maria will need to evaluate whether to appeal again based on the new assessment. Between now and 2027 she will save approximately $1,583 per year, or roughly $4,749 total over three years, in exchange for two hours of work.
The AV reduction also carries forward into the Board of Review process if she had chosen to appeal further. She did not need to — the full reduction was granted — but the option was available.
What Made This Appeal Successful
Looking back at Maria's appeal, several things went right:
1. The Purchase Price Was the Strongest Possible Evidence
Buying a property at arm's-length in October 2023 and receiving a notice implying a $550,000 value in May 2024 — in a market that had not appreciated significantly — made for a compelling, nearly airtight case. The Assessor's implied value was flatly inconsistent with a recent, voluntary market transaction. Assessors are trained to take recent purchase prices very seriously.
2. The Comparables Corroborated the Purchase Price
Maria did not rely solely on her purchase contract. She backed it up with four additional comparable sales, all supporting the same general value range. The Assessor had multiple independent data points, not just one transaction, all telling the same story.
3. The Evidence Was Organized and Complete
The appeal was filed with a clear cover memo summarizing the argument, MLS printouts for each comparable, and the settlement statement and purchase contract for the subject property. Nothing was missing. The reviewer did not have to search for information — it was all there.
4. She Filed Well Within the Deadline
Filing two weeks after receiving the notice (with two weeks still remaining before the deadline) gave Maria enough time to gather strong evidence without rushing, and ensured there was no risk of a clerical deadline miss.
What This Means for You
Maria's situation is not unusual. Across Chicago — especially in high-demand neighborhoods like Logan Square, Wicker Park, Lincoln Square, and Pilsen — the 2024 reassessment pushed many assessed values above what the actual market evidence supports. Buyers who purchased in 2022, 2023, or early 2024 may find that their purchase price directly contradicts the Assessor's implied value.
If you bought your Chicago home recently and have not checked whether your assessed value aligns with your purchase price, that check should happen today. Go to cookcountyassessor.com, look up your PIN, divide your AV by 0.10, and compare it to what you paid. If there is a meaningful gap — and "meaningful" is a matter of judgment, but anything over $20,000 is worth looking at — you likely have grounds for an appeal.
Even if you did not purchase recently, if you believe your neighborhood's market values are lower than the Assessor's model suggests, comparable sales can make your case. The key is assembling strong evidence and filing before the deadline.
The Lesson from Logan Square
A two-hour investment in gathering evidence and filing a free appeal resulted in $1,583 per year in savings — and potentially $4,700+ over three years before the next reassessment. The appeal system works when you give it something to work with. Purchase price plus corroborating comparable sales is the most powerful combination available to a recent buyer. If you have that combination and have not filed, you are leaving real money on the table.
What If the Assessor Had Denied the Appeal?
If the Assessor had denied or only partially granted Maria's appeal, she would have had two remaining options:
Board of Review: She could have filed during the Jefferson Township's BOR window (Logan Square is in Jefferson Township). The BOR is a fully independent review — a denial at the Assessor level does not carry forward as a presumption against her. Many appeals that fail at the Assessor level succeed at the Board of Review. The same evidence package, possibly updated with more recent comparable sales, would be submitted.
PTAB: If both the Assessor and BOR denied the appeal, and the potential savings justified it (they likely would not for a $1,500/year savings, but would for larger amounts), she could file with PTAB within 30 days of the BOR decision — ideally with an attorney.
In Maria's case, none of that was necessary. The evidence was strong enough that the Assessor granted the full reduction at the first level. But knowing the next steps exist — and that a denial at one level is not the end of the road — is important context for any homeowner navigating this process.
Continue Reading
Part of the Camille Canales Group property tax education series:
→ Chicago Property Taxes Explained: Key Dates, Tools, and Expert Help
→ Cook County Reassessment Years: What Chicago Homeowners Need to Know
→ How to Appeal Your Cook County Property Tax Assessment: A Step-by-Step Guide
→ The Property Tax Appeal Checklist for Chicago Homeowners
→ Property Tax Appeal FAQ: Every Question Chicago Homeowners Ask Us
Did You Recently Buy in Chicago?
If you purchased a Chicago home within the past year or two and have not checked your assessed value against your purchase price, it takes five minutes and could be worth thousands of dollars. Reach out and we can walk you through it.
Camille Canales Group | Compass | ccg-chicago.com | 773-377-9200. The case study presented is illustrative and representative of the Cook County appeal process. The property, owner, and specific facts are fictional. Results vary based on individual circumstances, evidence quality, and assessor decisions. This article does not constitute legal or tax advice. Consult a licensed attorney for advice specific to your property.
