Lyons Township Commercial Tax Appeal: Deadline & Trends

Why 2026 is the year for Lyons commercial owners

Cook County reassesses every property on a three-year triennial cycle. Lyons Township — in the south/southwest suburban group covering La Grange, Western Springs, Hodgkins, Indian Head Park, and Burr Ridge — is part of the triad being reassessed in 2026. The value the Assessor sets this year is the baseline that drives your commercial tax bill until the next reassessment.

That's what makes a reassessment year the most important time to act. A commercial assessment set too high in 2026 doesn't quietly fix itself — it compounds across the cycle. And because commercial assessments are typically much larger than residential ones, even a modest percentage reduction can mean a substantial dollar figure on the bill.

The Lyons Township commercial appeal deadline

Cook County doesn't use a single county-wide deadline. Each township opens on its own schedule, and the dates move year to year. The reliable way to find yours is the Assessor's Assessment & Appeal Calendar, which lists when Lyons "opens" and the "last file date" to appeal — and in a reassessment year, the deadline is also printed on the last page of your reassessment notice.

• 2026 reassessment notice Watch for your Lyons notice Lyons's Assessor window ran July 23 to September 3, 2026. Your filing deadline is also on the notice itself.
• First filing Cook County Assessor's Office (CCAO) File during the township's open window — several weeks (42 to 47 days in 2026). For commercial property, income-and-expense evidence does the most work here.
• Second filing Cook County Board of Review (BoR) An independent body that opens after the Assessor's window. You can appeal here even if the Assessor reduced you only partially — or not at all.
• If still over-assessed PTAB or Circuit Court For larger commercial disputes, the Illinois Property Tax Appeal Board or the courts remain available after the Board of Review.

What the 2025 Lyons results show

The clearest read on what happens to a Lyons appeal comes from the 2025 results. Across 4,162 homeowner appeals, counting each appeal once (a condo building's units, or a multi-parcel commercial filing, decided together, are one appeal), 480 ended in a change — a success rate of 11.5%, or roughly one in nine. But the township-wide number hides a wide spread between property classes.

Three patterns stand out. First, the commercial class (5-17) had by far the highest success rate at 41.4% — more than three and a half times the homeowner average. Second, that result came on just 29 appeals, a much smaller sample than the residential classes, so it can swing more from year to year. Third, residential condo appeals (Class 2-99) had a strikingly low 5.9% rate (3 of 51), a reminder that volume doesn't equal success.

For a commercial owner, the takeaway is direct: in 2025, well-supported commercial appeals in Lyons were among the most likely to produce a change — but "well-supported" is the operative phrase, because the small sample means each case rose or fell on its own facts.

How much assessed value actually moved

A change isn't only about whether the appeal succeeded — it's about how much value came off. In Lyons in 2025, winning homeowner appeals cut assessed value by about $5,600 on average, or roughly 8.5%; winning one-story commercial (5-17) appeals cut about 15.5%. Across all appeals of every property type, the total assessed value removed was about $19.8 million.

Why it matters: your appeal targets your assessed value, which determines your share of the local tax levy. A lower assessed value doesn't rewrite the entire bill, but it reduces the portion tied to your property. On a commercial parcel — where the assessed values are larger to begin with — that percentage can translate into real money.

What actually wins a commercial appeal

Commercial appeals turn on different evidence than residential ones. The strongest grounds:

1. Income approach evidence (the centerpiece)

Cook County values most commercial property on income — estimated rent, vacancy, collection loss, and expenses, with a capitalization rate applied. Your actual rent roll, leases, and operating statements are the most direct way to show the Assessor's assumed income is too high.

2. Lack of uniformity

If comparable commercial properties nearby are assessed at a lower level relative to income or square footage, your assessment is non-uniform and should be brought in line.

3. Overvaluation vs. market

A recent purchase, a current appraisal, or comparable commercial sales below the Assessor's implied market value.

4. Factual and classification errors

Wrong square footage, an incorrect class, or characteristics that don't match the building. These corrections can move the assessment on their own.

How to file your Lyons commercial appeal

1. Find your PIN and pull your assessment. Confirm the proposed assessed value and the property characteristics on record with the Assessor.
2. Check the calendar / your notice. Confirm Lyons' current open and last-file dates — in 2026 the deadline is also on your reassessment notice.
3. Assemble income documentation. Rent roll, leases, and a recent income-and-expense statement. This is the heart of a commercial appeal.
4. File with the Assessor. Submit your appeal and financials before the last-file date.
5. File with the Board of Review. A separate, independent filing — a genuine second chance.
6. Escalate if warranted. For large disputes, PTAB or the courts remain available after the Board of Review.

Working with us on a Lyons commercial appeal

Commercial appeals reward experience with the income approach and with how the Cook County Assessor and Board of Review weigh financial evidence. We review your rent roll and operating statements against the Assessor's assumptions, build the comparable and cap-rate case, and file at both the Assessor and the Board of Review — then escalate if the numbers justify it.

We work on contingency: no upfront cost, and we're paid a share of the savings only if the appeal reduces your bill. If your assessment is already fair, the honest answer is to tell you so — and we will. On commercial property, where the dollars are larger, that candor matters.