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Tax appeal appraisal report ready to file with a PTAB petition before the 30-day deadline
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Property Tax
Lost at the Board of Review? What Comes Next

When the Board of Review turns down a Cook County tax appeal, a short clock starts running. The next stop is the Illinois Property Tax Appeal Board, and the PTAB appeal appraisal has to be ready much sooner than most people expect. Here’s how the window works and what PTAB wants to see in the appraisal.

By the end of this article, you’ll know:

  • How the 30-day PTAB deadline is counted in Cook County
  • Why the appraisal has to be filed with the petition, not later
  • What tax consultants can line up before the clock starts

The 30-Day Clock Has Two Possible Start Dates

Illinois law sets the deadline in 35 ILCS 200/16-160. In most counties, you get 30 days after the written notice of the Board of Review decision. Cook County works a little differently.

In Cook, the appeal is due within 30 days of the Board’s notice or 30 days after the Board sends its final action on the township to the Assessor, whichever is later. So two parcels decided the same week can have different deadlines. PTAB also asks Cook County filers to include the Board’s final decision. If you file after the township is certified, it wants the township close date too, according to its practice and procedures page.

Timing is live right now. The Cook County Board of Review’s third group of 2026 townships, which includes Lyons, Northfield, Stickney, and West Chicago, closes for filing on November 6. Decisions for earlier groups will keep arriving through the season, and each one starts its own count. With the south suburbs reassessed this year, as we covered in our piece on the 2026 south suburbs reassessment, plenty of owners will be looking at that next step.

Two other points in the same statute are worth a quick look. Missing a Board of Review hearing you were properly notified of can cost you PTAB jurisdiction. And a taxpayer who files at PTAB gives up certain valuation objections in court. Which route fits a given case is counsel’s call, not the appraiser’s.

PTAB Starts Fresh, but Its Record Closes Early

PTAB hears appeals de novo, as if the Board of Review never decided the case. The Cook County Board of Review’s own PTAB page notes that PTAB isn’t limited to the evidence the Board saw. So a thin Board of Review file can still become a strong PTAB case.

The catch is timing. Under PTAB Rule 1910.30, your evidence goes in with the petition. If the appraisal isn’t done, you need to ask for an extension in writing at the same time you file. PTAB then grants 30 days. Without that request, no evidence is accepted after the petition is filed.

Rebuttal won’t rescue a late appraisal either. Rule 1910.66 says rebuttal can’t be new evidence such as an appraisal. It can, however, include a review appraisal or a written critique of the other side’s appraisal by a real estate appraisal expert. Generally, the hearing itself won’t take new documents either. That’s why the record matters so much on day one.

What a PTAB Appeal Appraisal Needs to Include

PTAB calls an appraisal generally the best evidence of market value, but it is specific about what counts. A letter of opinion isn’t enough, because the Board can’t check the data behind it. A full appraisal should examine the cost, income, and sales comparison approaches where possible, and show the data it relied on.

The value also has to land on the right date. PTAB weighs market value as of the January 1 assessment date, so a report built for a loan or a sale may not line up. Our article on what a tax appeal appraisal must contain walks through those basics. Our explainer on mass appraisal versus a single-property appraisal shows why the Assessor’s number and market value can drift apart.

Adjustments matter too. In one Cook County decision, Docket 20-32775, PTAB favored an appraisal with detailed adjustments to four sales over the Board of Review’s raw, unadjusted sales data. Comparable sales still need a reason behind every adjustment.

Commercial appeals carry an extra warning. PTAB says vacancy alone isn’t enough. Neither is an income statement prepared by an attorney, unless market data supports it. So the rent, vacancy, and expense figures should tie back to the market, the way our guide to the income approach for commercial property lays out.

Plan for the Appraiser to Testify

PTAB doesn’t require the appraiser to testify. Still, it calls testimony a best practice and recommends it. When the appraiser doesn’t appear, the appraisal may carry less weight. Also, an appraiser can testify to value only if a signed appraisal was submitted on time.

Some practical details come with a hearing. When $100,000 or more of assessed value is at issue, the appellant has to provide a court reporter. So it helps to confirm the appraiser’s availability before the hearing date is set, not after.

Be Honest About How Long PTAB Takes

PTAB is not quick. After filing, the Board of Review has 90 days to respond, and extensions are possible. Then each side gets 30 days for rebuttal before a hearing or a decision on the record. In Docket 20-32775, a 2020 tax year appeal, the final decision was issued in August 2024.

That wait has a few upsides and a few traps. If PTAB lowers an assessment, the county treasurer refunds the excess with interest. But for commercial and industrial property, the Property Tax Code doesn’t require a PTAB reduction to carry into later years. Owners appeal each year on its own, though PTAB lets them file the same evidence if it reflects value for that year. Plan the appraisal budget with that in mind.

For Tax Consultants, Line Up the File Before Day One

Tax consultants often see the Board of Review decision first, so they set the pace. PTAB’s rules draw a clear line here. An LLC, corporation, or partnership must be represented by an Illinois-licensed attorney. Tax representatives and appraisers may testify and assist counsel, but they can’t question witnesses.

That leaves real work you can own. First, log the notice date and the township close date the day the decision arrives. Second, pull the Board’s final decision and send it to the attorney with your deadline math. Third, get the appraiser the rent roll, recent operating statements, and any lease changes right away. If the appraisal can’t finish in time, tell counsel early, so the extension request goes in with the petition.

Board of Review Decision Just Arrived?

PahRoo prepares tax appeal appraisals valued as of January 1, with the data PTAB expects to see and an appraiser ready to testify. Send us the decision date and the property, and we’ll work to your filing window.

Start the PTAB Appraisal

Frequently Asked Questions

How long do I have to appeal a Board of Review decision to PTAB?

In Cook County, 30 days after the Board of Review’s written notice or 30 days after the Board sends its final action on the township to the Assessor, whichever is later. In other Illinois counties, it’s 30 days after the written notice.

Can I give PTAB evidence the Board of Review never saw?

Yes. PTAB hears appeals de novo and isn’t limited to the Board of Review’s evidence. But the evidence has to be filed with the petition, or within an extension you request when you file.

Can I add an appraisal later as rebuttal?

No. PTAB’s rules bar new evidence such as an appraisal in rebuttal. Rebuttal can include a review appraisal or a written critique of the other side’s appraisal.

Does the appraiser have to testify at PTAB?

It isn’t required, but PTAB recommends it as a best practice. If the appraiser doesn’t appear, the appraisal may be given less weight.

How long does a PTAB appeal take?

It varies, and it can take years. In one Cook County case, a 2020 tax year appeal was decided in August 2024. If the assessment is lowered, the county treasurer refunds the excess with interest.

Cook County Appraisals From Board of Review to PTAB

PahRoo Appraisal & Consultancy works with property tax attorneys and tax consultants from our Lincolnwood office, and we also appraise in Dallas, Philadelphia, Phoenix, and Naples. Michael Hobbs, MAI, SRA, signs our Illinois reports and is available to testify. Learn more about our Chicago and Cook County appraisal team.

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Hearing table set for appraiser expert testimony in a property tax appeal
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Property Tax
When the Appraiser Testifies in a Cook County Tax Appeal

Most Cook County appeals never put an appraiser in front of anyone. The Board of Review reads the report, and the attorney argues. But once a case climbs to the Property Tax Appeal Board, appraiser expert testimony can decide whether that report counts at all. So the time to ask who will testify is before you hire the appraiser, not after the hearing notice arrives.

By the end of this article, you’ll know:

  • Why the report has to stand alone at the Board of Review
  • What happened at PTAB when the appraiser stayed home
  • Where the appraiser’s testimony ends and counsel’s argument begins

The Board of Review Hears From Counsel, Not the Appraiser

First, look at who is allowed in the room. Under the Cook County Board of Review’s official rules, only licensed attorneys and taxpayers representing themselves may practice before the Board. The rules also say nothing about appraisers testifying.

So at this stage the appraisal speaks for itself. Rule 19 sets the bar it has to clear. An Illinois-licensed or certified appraiser who is competent with the property type must prepare it. The appraiser signs the USPAP certification. And the value has to sit at the January 1 lien date.

In practice, that means the report must answer the questions an analyst would ask if the appraiser were there. Why these comparables? Why this adjustment? Why this date of value? If the answer lives only in the appraiser’s head, it never reaches the Board. Our guide to what a BOR appraisal must contain walks through the full checklist.

At PTAB, Appraiser Expert Testimony Can Decide the Appeal

The Property Tax Appeal Board works differently. Under 86 Ill. Adm. Code 1910.67, any party can force a hearing by asking in writing. Witnesses testify under oath. And subsection (l) adds a rule every tax attorney should know cold. Testimony about an appraisal comes only from a preparer whose signature appears on it, and only if the appraisal went in on time.

Now consider what can happen when nobody shows up. In one Cook County appeal from the 2010 tax year, the taxpayer filed an appraisal, but neither appraiser attended. The board of review objected that the report was hearsay. PTAB agreed and gave no weight to the appraisers’ adjustments or their opinions of value. It looked only at the raw sales, found the assessment within range, and denied the reduction.

That wasn’t a one-off. PTAB reached the same result in Cook County appeals from the 2015 and 2016 tax years. In the 2015 case, the Board found the appraisal was hearsay on its own motion. How any one appeal plays out is a judgment for counsel. Still, an appraiser who can’t commit to the hearing date is a risk you can see from day one.

What the Appraiser Covers, and What Stays With Counsel

Above all, good testimony stays in its lane. The appraiser explains the valuation. That means highest and best use, why each comparable made the cut, how the adjustments were built, and how the approaches reconcile. For income property, it also means the rent, vacancy, and cap rate choices behind the income approach in a tax appeal.

The legal side, however, belongs to the attorney. Burden of proof, uniformity arguments, and whether the evidence meets the standard are all counsel’s calls. When an appraiser drifts into legal argument, cross-examination gets easier for the other side. When the attorney tries to defend an adjustment the appraiser should explain, the record gets thinner.

In other words, that division is the strength. The attorney frames the case, and the appraiser proves the number under oath. Each one is more credible doing their own job.

For Litigation Attorneys, Plan the Expert Before the Hearing Date

If you handle valuation disputes outside the tax lane, the same lesson travels. A few moves pay off early.

First, confirm that the person who signs the report will be the person who testifies. At PTAB that is the rule, and in court it keeps the opinion and the witness in one place. A firm name on the cover is not enough.

Next, ask how often the appraiser has been cross-examined. Writing a sound report and defending it live are different skills. You want someone who has done both.

Then plan for disclosure. In Illinois circuit court, Supreme Court Rule 213(f)(3) requires a party to identify a retained expert’s subject matter, opinions and their bases, qualifications, and reports. So every basis for the value should already sit in the appraisal, not surface for the first time on the stand.

Finally, if the other side has an appraisal, consider a USPAP appraisal review of it. A review appraiser tests the opposing report’s data and reasoning, which gives you material for cross without turning your own appraiser into an advocate.

Hire the Appraiser Who Will Be in the Room

Before you engage anyone for an appeal that might go past the Board of Review, ask three plain questions. Will the signing appraiser testify if the case reaches PTAB or court? Have they held up under cross before? And will the report carry every reason behind the value on its own? If the answer to any of them is no, find out now, while you still have time to change course.

Will Your Appraiser Show Up at PTAB?

PahRoo prepares appeal appraisals built for review, and the appraiser who signs is available to testify. Tell us about the property and where the appeal stands.

Bring Credible Testimony

Frequently Asked Questions

Can an appraiser testify at a Cook County Board of Review hearing?

The Board’s rules limit practice before it to licensed attorneys and taxpayers representing themselves, and they do not provide for appraiser testimony. Plan for the appraisal report to speak for itself at that stage.

Does the appraiser have to attend a PTAB hearing?

Only a preparer who signed the appraisal can testify about it at PTAB. In several Cook County appeals, PTAB has given no weight to the value opinions in an appraisal when the appraiser did not testify and the report was treated as hearsay. Whether to bring the appraiser is a call for counsel, but the safe plan is to have them available.

Who can testify about an appraisal at the Property Tax Appeal Board?

Under 86 Ill. Adm. Code 1910.67(l), appraisal testimony may only come from a preparer whose signature appears on the appraisal, and the appraisal must have been submitted on time.

What does an appraiser’s testimony cover in a tax appeal?

The valuation itself, meaning highest and best use, comparable selection, adjustments, the income analysis where it applies, and how the approaches reconcile. Legal argument, such as burden of proof or uniformity, stays with the attorney.

What makes appraisal testimony credible?

Testimony that matches the written report, comes from an appraiser competent with that property type, and admits the weak spots in the data instead of overselling. Experience under cross-examination helps too.

Valuation Support From Filing Through Hearing

PahRoo Appraisal & Consultancy works with property tax attorneys across Cook County, from the first look at an assessment through a contested hearing. Michael Hobbs, MAI, signs our Illinois reports and is available to testify on them. Attorneys can request a preliminary opinion of value before committing to a full report, or read how our tax attorney referral program works. For income property, see our commercial appraisal services and our Chicago appraisal coverage.

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Calendar open to January 1 beside a house key, the effective date for a retrospective appraisal tax appeal
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Property Tax
January 1 Is the Only Date That Matters in a Tax Appeal

A Cook County appeal can be argued in October, decided in December, and appealed to the state the following spring. None of those dates matter to the value. Illinois assesses property as of January 1. So a retrospective appraisal tax appeal has one effective date, fixed by statute, whether the hearing lands eight months later or eighteen. The most common way a strong appeal loses is not a bad comparable. In practice, it is an appraisal dated the wrong day.

By the end of this article, you’ll know:

  • Where the January 1 date comes from and what the Board of Review and PTAB do with it
  • How an appraiser rebuilds a January 1 value from evidence that arrives months later
  • Why a refinance or purchase appraisal with the wrong date can sink an otherwise good case

Where the January 1 Date Comes From

The rule is in the Property Tax Code. Under section 9-155, the assessor determines the value of each property “as of January 1 of that year.” So everything downstream inherits that date. The assessment is a fraction of fair cash value on January 1. The Board of Review decides whether that fraction is right on January 1. Then the Property Tax Appeal Board, if the case gets that far, rules on the same day’s value.

Cook County adds a wrinkle that makes the date carry more weight, not less. The county reassesses on a three-year cycle, township by township. We covered that cycle in our piece on the 2026 south suburbs reassessment. A value set as of January 1 in a reassessment year becomes the base for the next two years’ bills. So get that one date right and the benefit compounds. Get it wrong and so does the cost.

What a Retrospective Appraisal Tax Appeal Has to Prove

The PTAB’s own rules spell out what counts as proof of market value. Under 86 Ill. Adm. Code 1910.65, the Board will look at an appraisal of the subject “as of the assessment date at issue.” It will also look at a recent sale of the subject, at construction costs if the build date is close to the assessment date, or at three or more comparable sales with support for their similarity. Every one of those is anchored to the same January 1.

The same Part makes PTAB proceedings de novo. The Board considers only what is submitted to it, and gives no weight to what happened at the Board of Review. So an appraisal that carried the day at the county level has to be filed again at the state level. And an appraisal never dated to January 1 does not improve by being resubmitted. Our article on Board of Review evidence rules covers the county-level requirements in detail.

Also, the word “retrospective” describes the work, not the report type. By the time an appeal is heard, January 1 is in the past. The appraiser has to establish what a buyer and seller would have agreed to on that date, using only what was knowable then. That is a different discipline from a current-value appraisal. It shows most in the comparable selection.

Rebuilding January 1 From Evidence That Arrives Later

Consider a hypothetical Northbrook house reassessed for 2026. The appeal is filed in the fall, so the hearing sits well past the date. By then the appraiser can see sales from November 2025, February 2026, and June 2026. The November and February sales bracket the date and need only a small market conditions adjustment to land on January 1. The June sale is a different matter. If the market moved between January and June, the adjustment has to run backward to the effective date. The report should say how the appraiser measured that movement.

Physical condition follows the same logic, too. A roof that failed in March does not lower the January 1 value. A basement that flooded in December 2025 does. Permits, listing photos, inspection reports, and the property record card all help establish what the house looked like on the first of the year. In Cook County the record card also shows the characteristics the assessor used. So errors in living area, age, or condition rating are among the cleanest grounds for a change. They go to the assessor’s own inputs on the assessor’s own date.

Sales of the subject, meanwhile, deserve their own note. A closing near January 1 is powerful evidence, and both the PTAB rules and most county boards treat it that way. A closing well after the date is still useful, but it has to be adjusted back. The further it sits from January 1, the more the argument depends on the adjustment rather than the price.

The Refinance Appraisal Problem

Tax consultants running volume appeals see this one constantly. An owner refinanced in May, has a lender’s appraisal in hand, and wants to use it. The report is competent, of course. It is also dated May, prepared for a lender, with an intended use of mortgage lending. Submitted as-is, it invites the obvious objection. This is not a January 1 value, and it was not prepared for this purpose.

The fix is not to throw the report away. Instead, ask the appraiser, or a new one, for a retrospective value as of January 1 with the appeal as the stated intended use. Then the lender’s report becomes source material for condition and characteristics. The new report supplies the date and the purpose. For a consultant managing dozens of parcels, check the effective date and intended use on every appraisal before filing. That two-minute step will save more cases than any other.

Other States, Same Date

January 1 is not an Illinois quirk. Florida assesses as of January 1 as well, and its Value Adjustment Board petitions turn on that date the same way. Texas uses January 1 for most property as well. The mechanics of the appeal differ from state to state. But the appraiser’s task is the same everywhere PahRoo works: find the value on the lien date, not the hearing date.

The divorce lane has its own version of this problem, where the date is chosen rather than fixed. We covered that in our article on the date of value in a divorce appraisal. The tax version is simpler in one way and harder in another. Simpler, because nobody argues about which date applies. Harder, because evidence keeps arriving after the date has passed, and the appraiser has to keep it out.

Check the Date Before You Check the Number

Before an appraisal goes into an appeal file, confirm three things on its first page. The effective date is January 1 of the assessment year at issue. The intended use names the assessment appeal, not a loan. And the comparable sales either bracket the date or carry a stated market conditions adjustment back to it. If any of the three is missing, then the number on the cover is answering a question the Board did not ask. So fix the date first. The value follows.

Is Your Client’s Appraisal Dated January 1?

PahRoo prepares retrospective appraisals as of the assessment date for Board of Review and PTAB appeals, with the intended use and adjustments the rules expect.

Value It as of January 1

Frequently Asked Questions

What date does an Illinois property tax appraisal have to use?

January 1 of the assessment year at issue. Section 9-155 of the Property Tax Code sets the assessor’s valuation date at January 1, and the PTAB rules describe acceptable proof of value as an appraisal “as of the assessment date at issue.” An appraisal dated any other day is answering a different question.

Can I use a refinance appraisal for a tax appeal?

Usually not as-is. A lender’s appraisal carries the lender’s effective date and an intended use of mortgage lending. It can be useful source material for condition and characteristics, but the appeal needs a report with a January 1 effective date and the assessment appeal named as the intended use.

What is a retrospective appraisal?

An appraisal with an effective date in the past. The appraiser estimates value as of that earlier date using only information a market participant could have known at the time, and adjusts later evidence back to the date. Every tax appeal appraisal is retrospective, because January 1 has passed by the time the appeal is heard.

Do sales after January 1 count in a tax appeal?

They can, with care. A sale shortly after the date is often the best evidence available, and it can be adjusted back to January 1 for any market movement in between. The further a sale sits from the date, the more the argument depends on the adjustment rather than the price, and the report should show how the adjustment was measured.

Does the PTAB accept the appraisal I filed with the Board of Review?

Only if you file it again. PTAB proceedings are de novo under 86 Ill. Adm. Code 1910.50, which means the Board considers only the evidence submitted to it and gives no weight to what the county board decided. The appraisal must be part of the PTAB record on its own.

January 1 Valuations for Illinois Appeals

Property tax attorneys and consultants across Cook County and the collar counties rely on PahRoo Appraisal & Consultancy for retrospective appraisals dated to the assessment year. Our MAI and SRA designated team prepares reports for Board of Review and PTAB filings as part of our appraisal services, and our property tax appeal FAQs cover what clients ask first. To discuss a parcel or a portfolio, contact our team.

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Tax appeal appraisal report and comparable sales evidence prepared for a Cook County Board of Review filing
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Property Tax
Tax Appeal Appraisal: What the Cook County BOR Requires

A tax appeal appraisal is only as strong as the evidence rules it satisfies. The Cook County Board of Review has specific requirements, and a report that misses them loses weight before anyone reads the value conclusion. So attorneys and CPAs who order appraisals for appeals need to know exactly what the document must contain.

By the end of this article, you’ll know:

  • The specific evidence the Cook County Board of Review expects with an appraisal
  • Why the lien date, not the filing date, controls the valuation
  • The disclosure and documentation traps that sink otherwise solid appeals

What a Tax Appeal Appraisal Must Contain for the Board of Review

Start with the Board’s own rulebook. The official rules of the Cook County Board of Review spell out the baseline. An appraisal filed with an appeal must include an original photograph of the subject property’s front. It must also list the permanent index number of the subject and of every property used in the appraiser’s analysis. Miss either element, and analysts can discount the report without weighing its conclusions.

The report also has to stand on verifiable comparable evidence. Analysts pull the same public sales records the appraiser used, so every comparable needs a traceable sale that supports the adjustments. Because of that, we build our appraisal reports so each comparable can be checked against county records without a single follow-up question.

The Lien Date Controls Everything

Cook County values property as of January 1 of the assessment year, the lien date. An appraisal with a mid-summer effective date answers the wrong question, even if the analysis is otherwise careful. The report must establish market value as of that lien date, using sales that bracket it.

This trips up more appeals than any technical rule. A refinance appraisal from May, for example, was prepared for a different purpose and a different date. It can still matter, though, which leads to the disclosure problem below.

Disclosure Rules That Catch Filers Off Guard

The Board requires a completed Historical Summary Form for most non-residential appeals. Any transfers or prior appraisals must be disclosed on it. The Assessor’s rules go further. Filers must provide any appraisal or valuation report on the subject prepared within two years before the lien date. That includes reports done for financing or management purposes. So that May refinance appraisal is not optional background. It is discoverable evidence, and hiding it damages credibility.

Income-producing properties carry their own paper burden. Where the property is leased or available for lease, the Board asks for Schedule E filings for the three years before the lien date. Vacancy claims need current income and expense documentation. A tax appeal appraisal for these properties should anticipate that record set, not contradict it.

USPAP Compliance Is a Threshold, Not a Bonus

Appraisals in gross violation of USPAP standards will not be treated as credible evidence. Worse, the Assessor’s office can refer them to the IDFPR for investigation. That is a real professional consequence, and it explains why a cheap report is expensive. Standards published by The Appraisal Foundation govern how the analysis must be developed and reported, and appeal analysts know those standards well.

In practice, USPAP compliance shows up as documented adjustments, a supported highest and best use conclusion, and a clear reconciliation. Boilerplate gets noticed. So does an adjustment grid with no market support behind the numbers.

Build the Evidence File Before the Township Opens

Township windows open on a rolling schedule, and evidence deadlines follow quickly once a township closes. The Board accepts supplemental evidence only up to a set point before the hearing. So a report commissioned late arrives rushed, or after the door shuts. The better sequence starts early. Identify the properties worth appealing, then order the appraisal with the lien date and the Board’s rules written into the engagement. File with a complete package. Appeals resolved on the written file get the same review as those with hearings, which means the written file has to carry the whole case.

Filing at the Board of Review this season?

PahRoo prepares lien-date appraisals built to the Board’s evidence rules, with comparables an analyst can verify line by line.

Get Appeal-Ready Evidence

Frequently Asked Questions

What evidence does the Cook County Board of Review accept?

The Board accepts appraisals, comparable sales data, photographs, and closing documents from a recent purchase. Documentation of factual errors, such as incorrect square footage, also counts. Appraisals must include a front photo of the subject and the PIN of every property in the analysis.

What should a tax appeal appraisal include?

It should establish market value as of the January 1 lien date and comply with USPAP. It also needs verifiable comparable sales with permanent index numbers and a front photograph of the subject. Adjustments need market support an analyst can trace.

Can I appeal my Cook County property taxes myself?

Individual owners can represent themselves on residential appeals. Properties held by corporations, LLCs, or other entities must be represented by an attorney under the Board’s rules. Either way, the evidence requirements are the same.

Do I have to disclose a prior appraisal in my appeal?

Yes. Transfers and prior appraisals must be disclosed on the Historical Summary Form. Reports prepared within two years before the lien date must also be provided, even ones done for financing purposes.

What does a Board of Review appeal cost?

Filing at the Board of Review is free. The real costs are professional ones: an independent appraisal if your case needs valuation evidence, and attorney fees where representation is required or advisable.

Appraisal Support for Cook County Appeal Work

PahRoo Appraisal & Consultancy prepares independent, USPAP-compliant valuations for property tax attorneys, CPAs, and owners across Cook County. If the 2026 cycle has clients asking questions, our guide to the 2026 Cook County reassessment covers when a new assessment deserves a formal challenge. Our property tax appeal FAQs answer the questions clients raise most.

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Commercial AppraisalsFor AppraisersFor Attorneys & Professionals
Commercial Real Estate Appraisal: When You Need One

A commercial real estate appraisal puts a defensible value on a property when real money rides on the number. Banks want one before they lend. The IRS wants one when an owner dies. Buyers, sellers, and partners heading for a split want one too. The work follows federal standards, and the report holds up under scrutiny because of it.

By the end of this article, you’ll know:

  • What a commercial appraisal measures, and how appraisers actually arrive at a value
  • Why the property type changes the whole analysis
  • The situations that call for one, from lender financing to a Cook County tax appeal
  • What drives the cost and turnaround, so you can plan around it

What a Commercial Real Estate Appraisal Measures

A commercial real estate appraisal is an independent opinion of value, prepared by a state-certified general appraiser under the Uniform Standards of Professional Appraisal Practice (USPAP). The appraiser inspects the property, studies the market, and supports the value conclusion with evidence.

This is not a home inspection. It also is not a broker’s price opinion, which a real estate agent can hand you for free. An appraisal carries more evidentiary weight, so courts, lenders, and tax authorities accept it. Residential appraisals lean mostly on recent home sales nearby. Commercial work runs deeper, because income, leases, and tenant quality all move the value.

The Three Ways Appraisers Reach a Value

An appraiser develops up to three approaches to value, then reconciles them into a single conclusion. For commercial property, one approach usually carries most of the weight.

The income approach estimates value from the rent a property produces. The appraiser starts with net operating income, which is gross rent minus vacancy and operating expenses. Then the appraiser divides that income by a capitalization rate pulled from comparable sales. A building with $200,000 in net operating income and a 7% cap rate points to a value near $2.86 million. A lower cap rate signals a lower-risk, higher-value asset. This method drives value for most income-producing property.

The sales comparison approach weighs recent sales of similar buildings, with adjustments for size, location, and condition. The cost approach estimates what it would take to rebuild, minus depreciation, plus the land value. It matters most for special-purpose or newly built property, where comparable sales are thin.

Why the Property Type Changes the Whole Analysis

The property type decides which data the appraiser leans on. A warehouse and a hotel do not get valued the same way, even at the same price point.

Office and retail values hinge on the leases. Lease length, rent levels, and the credit quality of the tenants all feed the income approach. A retail center anchored by a strong national tenant reads very differently from one with month-to-month locals.

Industrial and warehouse values turn on ceiling height, loading access, and proximity to highways and rail. Multifamily property with seven or more units gets treated as commercial, so the appraiser studies the rent roll and the unit mix. Hotels, gas stations, and self-storage are special-purpose properties. They often carry a business value on top of the real estate, and they need an appraiser who knows the category. So the right question is not just “what is it worth,” but “who is qualified to value this kind of asset.”

Appraisal or Evaluation: What Your Lender Actually Needs

An appraisal and an evaluation are not the same document, and the difference can change your timeline. Financing is the most common reason a commercial appraisal gets ordered.

Federal rules under FIRREA require an appraisal for most federally related transactions. For commercial property, the threshold sits at $500,000, raised from $250,000 in 2018. You can read the regulation itself in 12 CFR Part 323. Below that line, a bank can rely on a lighter “evaluation” instead. An evaluation costs less and turns around faster, but it does not meet USPAP and carries less weight.

There is also a business-loan carve-out. A loan of $1 million or less can skip the appraisal if the real estate is not the primary source of repayment. SBA financing usually calls for a full appraisal once the deal clears the program’s own limit. So if you are borrowing against commercial property above these thresholds, expect the lender to order one. Our commercial valuation work often starts with exactly this kind of request.

When You Need One Without a Bank in the Room

Plenty of appraisals have nothing to do with a loan. Any time a value carries legal or financial consequences, a USPAP appraisal earns its place.

Estate and gift tax. When an owner dies, the IRS wants a value as of the date of death. A qualified appraisal protects the estate if the return gets questioned later, and it supports a stepped-up basis for the heirs.

Divorce and partnership splits. When co-owners separate, someone has to value the real estate fairly. A neutral appraisal keeps the split from turning into a fight over numbers.

Litigation and financial reporting. Bankruptcy, eminent domain, and partner disputes all rely on a credible value. Companies also need appraisals to carry property correctly on their books.

Using an Appraisal in a Cook County Tax Appeal

A current appraisal is some of the strongest evidence you can bring to a commercial property tax appeal. In Cook County, the stakes are higher for commercial owners by design.

The county assesses most commercial and industrial property at 25% of fair market value, against 10% for homes (see the Cook County Assessor). So an inflated value hits a commercial owner harder than a homeowner. The county reassesses on a triennial cycle, split into three districts: the City of Chicago, the north suburbs, and the south and west suburbs. Each one gets reassessed every three years.

Timing matters here. A reduction you win in a reassessment year holds for the full three-year cycle, so that year is the one to watch. There are three levels of appeal: the Assessor’s Office, the Cook County Board of Review, and then the Illinois Property Tax Appeal Board or the Circuit Court. An appraisal is accepted evidence at each level.

At the Board of Review, a corporation has to be represented by an attorney. So commercial appeals usually pair a tax attorney with an independent appraisal. A well-supported appraisal shifts the discussion from opinion to documented analysis, and a documented value is harder for the county to wave off. Our Cook County reassessment work is built around exactly that.

What the Report Looks Like and What It Costs

USPAP allows two report formats, and the cost tracks the complexity of the property. An Appraisal Report lays out the full analysis. A Restricted Appraisal Report is shorter and meant for the client alone, so it works only when no third party will rely on it.

A small retail building might take a week or two. A complex mixed-use site with many tenants takes longer and costs more, because the analysis goes further and the data takes longer to gather. Ask for the report type and the timeline up front, so the appraisal fits your deadline rather than blowing past it.

How to Tell If You Really Need One

Use a simple test. If money, taxes, or a legal outcome turns on the value of a commercial property, get a USPAP appraisal rather than a rough estimate. A broker’s opinion can guide a listing price. It will not hold up in front of a judge, an assessor, or the IRS. When the number has to defend itself, the appraisal is what does the defending.

Put a Defensible Number on Your Property

PahRoo prepares commercial appraisals across the Chicago and Dallas markets for financing, tax appeals, estates, and disputes. Tell us the property and the purpose, and we will scope it for you.

Request a Commercial Appraisal

Frequently Asked Questions

How much does a commercial real estate appraisal cost?

Cost depends on the property type, size, and complexity. A simple building runs lower, while a multi-tenant or special-purpose property costs more because the analysis takes longer. Ask for a quote tied to your specific property and its intended use.

How long does a commercial appraisal take?

A straightforward property often takes one to two weeks. Larger or more complex assignments take longer, since the appraiser has to gather lease data, income records, and comparable sales before reaching a conclusion.

What is the difference between a commercial appraisal and a broker price opinion?

A broker price opinion is an agent’s informal estimate, often free, and it carries little evidentiary weight. A commercial appraisal follows USPAP and comes from a state-certified general appraiser, so lenders, courts, and tax authorities accept it.

Do I need a commercial appraisal for a property tax appeal in Cook County?

You do not always need one, but a current appraisal is strong evidence at the Board of Review or the Illinois PTAB. It gives you an independent value to counter the assessor’s figure, which can improve your odds on a commercial parcel. Note that a corporation must be represented by an attorney at the Board of Review.

Who is qualified to perform a commercial real estate appraisal?

A state-certified general appraiser is qualified to value commercial property. This is the highest appraisal credential, and federally related transactions require it. Make sure your appraiser holds the general certification rather than a residential license.

Need an Independent Appraisal?

PahRoo Appraisal & Consultancy provides commercial valuations along with estate, divorce, and property tax appeal appraisals in the Chicago and Dallas markets. Reach out when you need a value that stands up to scrutiny.


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Cook County land reassessment notice showing a south suburban land value increase
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Property Tax
What 2023’s Land Reassessment Errors Teach South Suburban Owners in 2026

In 2023, the Cook County land reassessment of the south and west suburbs produced numbers nobody could defend. ABC7’s I-Team reported homeowner assessments raised by as much as 650%. The driver was land values the Assessor’s own letter later admitted were “calculated incorrectly.” The errors spanned more than 4,000 properties before corrections ran. Here is why that history matters today. The same townships are being reassessed in 2026, by the same kind of mass-valuation machinery. The lesson of 2023 is not that the system failed once. It is that your notice deserves a reader.

By the end of this article, you’ll know:

  • What actually went wrong in the 2023 land reassessment, with sources.
  • How to read the land line on your 2026 notice before trusting the total.
  • What to do, and in which order, if your number looks wrong.

What Went Wrong in the Cook County Land Reassessment

The 2023 cycle revalued the south and west suburbs under the county’s triennial schedule. Then the complaints started. ABC7’s I-Team found homeowners with assessments raised by up to 650%. The land portion did the damage. By June 2024, the Assessor’s office acknowledged the problem in writing. Land values had been calculated incorrectly, and the errors totaled more than 4,000 properties.

The cleanup took both offices. The Assessor identified the affected parcels and submitted correction requests to the Board of Review. Then the Board worked through them. Also worth noting: the Assessor said affected owners would not have to do anything. Still, owners who read their notices caught the problem a year before the letters went out. The ones who did not read them paid attention only when the tax bill arrived.

Why It Matters Again in 2026

Cook County reassesses on a three-year rotation, so the south and west suburbs’ turn came around again in 2026. New notices mean new models, new land tables, and new chances for the 2023 pattern to repeat somewhere. That is not a prediction of failure. Mass assessment prices hundreds of thousands of parcels at once, and most come out reasonable. The point is narrower. After 2023, no south suburban owner should assume the number is right by default. We explained how the whole bill gets built in our property taxes made easy guide. The assessment is the foundation of all of it.

There is also a budget angle worth naming. South suburban owners already carry some of the county’s heaviest effective tax burdens, so an assessment error lands harder here than almost anywhere else. A wrong land value does not pad a bill by a rounding error. Instead, it compounds through the equalizer and the local rate, year after year, until someone challenges it. For example, an error caught at the notice stage costs an evening of paperwork. The same error caught two bills later costs real money and a longer fight.

Read the Land Line Before the Total

A reassessment notice splits your value into land and improvements, and that split is where 2023’s errors hid. So give the land line the first look. A land value that jumped sharply while the building value barely moved is the classic tell. Then compare against the block. Similar lots on your street should carry similar land values, and the county’s records are public. For example, a 6,000 square foot lot valued three times higher than the 6,200 square foot lot next door is not a market insight. It is a question that deserves an answer.

Keep the comparison honest, too. Corner lots, oversized lots, and commercial-adjacent parcels can differ for real reasons. The skill is the same one appraisers use for homes, which we covered in how appraisers compare homes. Like with like, or the comparison proves nothing.

If the Number Looks Wrong, the Rungs Are Open

The response path is the standard one, and it costs nothing to start. Township windows open at the Assessor and then at the Board of Review every year. Filing at the Board is free, and homeowners can file alone. Our homeowner’s guide to Cook County tax appeals walks the full process. For unusual parcels, high-value properties, or disputes that escalate, bring evidence instead. An independent residential appraisal separates the land question from the building question, with documentation behind each. Commercial and multi-unit owners have a heavier version of the same play in our commercial tax appeal guide.

Verify First, Pay Second

The 2023 Cook County land reassessment left behind one durable lesson. Assessment systems make mistakes at scale, and the correction machinery moves slower than the billing machinery. So the cheapest insurance in property taxes is ten minutes with your notice. Read the land line, compare the block, and question what does not fit. Most owners will find nothing. The ones who find something will be very glad they looked in 2026 instead of at the bill in 2027.

Would you notice if your land value was wrong by 650%?

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Frequently Asked Questions

What happened in the 2023 Cook County land reassessment?

Land values in parts of the south and west suburbs were calculated incorrectly. In cases ABC7 reported, assessments inflated by as much as 650%. The Assessor’s office acknowledged the errors, which totaled more than 4,000 properties, and submitted corrections to the Board of Review.

Were the 2023 errors fixed automatically?

The Assessor said affected owners would not have to do anything. Also, the office sent correction requests to the Board of Review. Still, the errors were caught because people noticed impossible numbers on notices. Automatic correction worked only after the problem was identified.

Is 2026 a reassessment year for the south suburbs?

Yes. Cook County reassesses on a three-year rotation, and the south and west suburbs’ cycle after 2023 is 2026. New notices carry new land values, which is exactly why the 2023 lesson applies now.

How do I check my land assessment?

Look at the land and improvement split on your notice. Then compare your land value to similar lots on your block using the county’s public records. A land value that jumped sharply while the building value barely moved, or that towers over comparable lots, is worth challenging.

When is an appraisal worth it for a land value dispute?

When the parcel is unusual, the dollars are large, or the dispute is headed past the first appeal rung. An independent appraisal documents what the land and improvements are each worth. That turns an argument about a confusing notice into a case about evidence.

A Second Opinion on the Assessor’s Number

PahRoo Appraisal & Consultancy has worked Cook County valuations for over two decades. An appraiser holding both MAI and SRA designations leads the firm. Maybe your notice needs a sanity check before the appeal window closes. Maybe a dispute calls for broader appraisal services, or a business property needs the commercial appraisal team. Either way, you get a documented value, not a guess, built to stand up to the office that disagrees with it.


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Attorney reviewing Cook County BOR appeals data and property tax documents
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Property Tax
What the $4.3 Billion Shift Means for Cook County Attorneys

Cook County BOR appeals produced one of the biggest property tax stories in the county’s recent history, and most of it happened in the data. In the 2024 Chicago reassessment, Board of Review appeals cut commercial assessed values by 17%, about $4.3 billion. Homeowners’ share of the assessed base rose from 49% to 54% as a result. Those are the Assessor’s own published numbers. For attorneys, the figures say two things at once. Appeals work, and appeals are being watched.

By the end of this article, you’ll know:

  • What the 2024 reassessment data actually shows, with primary sources.
  • Why rising scrutiny raises the evidence bar instead of closing the door.
  • How screening with prelims fits an appeal practice built for this climate.

What the Cook County BOR Appeals Data Shows

Start with the most recent completed Chicago cycle. Per the Cook County Assessor’s May 2025 release, the 2024 reassessment raised the city’s total assessed value by $9.1 billion. Then the appeals ran. The Board of Review reduced commercial values by 17%, about $4.3 billion. Residential values fell just 1%.

Meanwhile, the Class 5A story inside those numbers is striking. The Assessor raised offices, retail, and hotels by 21%. Appeals then stripped more than $3 billion back out. So the class ended the cycle at $14.3 billion, versus $14.4 billion when it began. A full reassessment, a round of appeals, and the needle barely moved. That is how much weight appeal outcomes carry in this county.

Put the percentages on one building to see the scale. Say a property carried a $10 million assessed value into the appeal season. A 17% reduction takes $1.7 million off the assessed base. Then the state equalizer and the local rate multiply whatever remains, so the bill moves by six figures for many properties. For example, a portfolio with five such parcels is deciding real money every season. That is why the appeal calendar now runs like a compliance calendar inside most commercial ownerships.

Three Years, $3.3 Billion, One Study

The multi-year picture is just as large. A Cook County Treasurer’s study covering 2021 through 2023, reported by WTTW News, found that business appeals reduced commercial tax bills by nearly $3.3 billion. Homeowners absorbed about $1.9 billion more as a result. Note the units, because they matter. The study measured tax bills, while the 2024 figures above measure assessed values.

Also, the study measured who files. Businesses appealed 64% of the time. Meanwhile, homeowners appealed 27% of the time. Also, residents of affluent areas appealed at 46%, against 11% in the lowest-income areas. The lesson for an appeal practice is plain: appealing is standard behavior for commercial owners, and the owners who skip it are the outliers paying for everyone else.

Scrutiny Is Rising, and the Evidence Bar With It

Numbers that size draw attention, and they have. The burden shift is now a recurring public story, and review bodies know their decisions get examined. Still, none of that makes appeals improper. The appeal is the system’s own correction step, and an over-assessed building has every right to the correct value. Still, the climate changes how cases should be built.

After all, a scrutinized decision needs a record behind it. So thin evidence is now a liability for everyone involved, while a documented valuation gives the Board something it can defend. We broke down what that record looks like in our piece on NOI and cap rates under scrutiny, and the full process in our commercial tax appeal guide. The pattern across both is the same. Win on underwriting-grade numbers, not on volume.

What This Means for an Appeal Practice

The data points to a practice model. First, screen widely, because the 64% appeal rate means clients expect filings and competitors are already making them. Second, triage before committing, since not every parcel has a real assessment-to-value gap. A preliminary opinion of value does that sorting. It checks a property or a portfolio against current market evidence, then flags where the gap justifies a full engagement. Firms can request a preliminary review directly.

Third, watch the calendar. The City of Chicago gets reassessed in 2027 under the triennial cycle, and that notice wave will start the next round of this same story. So attorneys who build evidence files now will meet it with cases already assembled. Meanwhile, the season never fully closes, because township windows open on their own schedules all year.

Win the Number With Evidence

The $4.3 billion shift settled one argument. Cook County BOR appeals move real money, year after year, cycle after cycle. Still, the open question is which cases hold up as the examination gets closer. So the answer has not changed, but the stakes have. Screen with data, file with evidence, and put a valuation behind the number that can survive the room reading it.

Your next appeal will be read more closely than your last one.

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Frequently Asked Questions

How much did BOR appeals cut commercial values in the 2024 reassessment?

Per the Cook County Assessor’s May 2025 release, Board of Review appeals reduced Chicago commercial assessed values by 17%, about $4.3 billion. Residential values fell about 1% in the same cycle.

Why did homeowners’ share of the tax base rise?

Property taxes in Cook County are levy-based, so the total collected gets split by assessed value. When commercial assessments fell on appeal, the residential side carried more of the split. Homeowners’ share of Chicago’s assessed value went from 49% to 54% after the 2024 appeals concluded.

Are commercial appeals still worth filing given the public scrutiny?

Yes. An appeal asks for the correct value, and an over-assessed building is subsidizing everyone else. The Treasurer’s study found businesses appeal 64% of the time, so filing is standard practice. What the scrutiny changes is the evidence bar, not the right to appeal.

How do attorneys decide which properties to appeal?

The efficient route is screening with a preliminary opinion of value. It compares the assessment to supportable market value across a property or a portfolio, before anyone pays for a full appraisal. The parcels with a real gap go forward. The rest wait for a better year.

What evidence does the Board of Review respond to?

Valuation evidence that reads like underwriting: documented income and concessions, comparable sales showing current cap rates, and capital needs that reduce net income. A USPAP-compliant appraisal carries that record into the hearing, with testimony behind it when needed.

The Valuation Partner Behind the Appeal

PahRoo Appraisal & Consultancy has worked Cook County tax appeals for over two decades. An appraiser holding both MAI and SRA designations leads the firm. Maybe your caseload needs portfolio screening through prelims ahead of the season. Maybe a contested file needs a commercial appraisal with the income analysis attached, or broader appraisal services across a dispute. Either way, the number arrives with the evidence attached, ready for the people who will try to pick it apart.


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Chicago commercial building whose Cook County property tax assessment is under appeal
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Property Tax
Chicago Commercial Property Tax Appeals, Explained

Every spring, Cook County mails out assessment notices. Every year, a share of them value commercial buildings at numbers the market no longer supports. Chicago commercial property tax appeals exist for exactly that gap. The appeal is not a favor and not a loophole. It is the built-in correction step of a mass assessment system, and owners who skip it simply pay the error.

By the end of this article, you’ll know:

  • How the Cook County appeal process actually runs, step by step.
  • Why the calendar matters, township by township, with 2027 ahead.
  • What evidence wins, and where a preliminary opinion of value fits.

How Chicago Commercial Property Tax Appeals Work

Start with how the bill is built. In Cook County, most commercial property is assessed at 25% of its fair market value. The state then applies an equalization factor, local exemptions come off, and the taxing bodies’ levies set the rate. So the assessor’s opinion of market value sits at the base of the whole calculation. If that opinion is too high, every step after it inflates the bill.

The appeal ladder has three rungs. First, owners can appeal to the Cook County Assessor when their township opens. Second, the Cook County Board of Review hears appeals as a separate, quasi-judicial body, and filing there does not require an Assessor appeal first. Third, owners who disagree with the Board’s decision can take the case on to the Illinois Property Tax Appeal Board. Most commercial cases are won or lost at the Board of Review, so that hearing is where the evidence file earns its keep.

The Calendar Runs by Township, and 2027 Is Coming

Appeal windows open township by township every year, and the Board of Review publishes those dates each season. Miss a window and you wait for the next cycle, not forever. Still, a missed year is a year of overpayment that never comes back.

Then there is the bigger date. The City of Chicago gets reassessed in 2027 under the county’s triennial cycle, so every commercial parcel in the city receives a fresh value. For office owners staring at a downtown market with vacancy near 27%, that notice will matter. Evidence gathered now does double duty. It supports this year’s appeal, and it becomes the response file when the 2027 number lands.

Evidence Wins Appeals. Opinions Do Not.

The Board of Review does not reduce assessments because an owner feels overtaxed. It responds to valuation evidence: rent rolls and concession data that show real income, comparable sales that show current cap rates, and documented costs that reduce net operating income. We covered how review bodies stress-test those inputs in our piece on NOI and cap rates under scrutiny, and the office-specific version of the story in our downtown office tax appeal breakdown.

The pattern holds across property types. A retail strip with two dark anchors, a warehouse with functional problems, a loop tower with a half-empty rent roll. In each case, the winning file reads like a lender’s underwriting package. After all, those are the numbers the market itself uses to price the building.

What Commercial Appeals Mean for Homeowners

There is a public debate here, and it deserves a straight answer. Property taxes in Illinois are levy-based. The taxing bodies decide how much to collect, and the assessed values decide how the total gets split. So when commercial assessments come down on appeal, the same levy spreads across the remaining base, and some burden shifts toward residential owners. That shift is real, and it is why commercial reductions draw headlines.

The honest framing is this: an appeal does not ask for a discount. It asks for the correct value. A building taxed above its market value is subsidizing everyone else, and a building taxed below it does the reverse. The fix for fairness runs through accurate values on both sides, which is also why documentation standards at the Board keep rising.

Where a Preliminary Opinion of Value Fits

Not every parcel justifies a full appraisal, and nobody wants to find that out after paying for one. A preliminary opinion of value screens a property or a whole portfolio against current market evidence first. Then it flags where the assessment-to-value gap is worth pursuing. Attorneys and owners can request a preliminary review directly. Where the gap is real, a full USPAP-compliant commercial appraisal carries the case at the hearing, with testimony behind it when needed.

Treat the Appeal as a Valuation Case

Chicago commercial property tax appeals reward preparation and punish improvisation. The process is annual, the rungs are known, and the 2027 reassessment is on the calendar. So the move is simple to describe and hard to shortcut. Screen the portfolio, build the evidence file once, and use it at every rung that needs it. The owners who treat the appeal as a valuation case, not a complaint, are the ones who stop overpaying.

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Frequently Asked Questions

Do I appeal with the Assessor or the Board of Review?

You can do either or both. The Assessor hears appeals when your township opens, and the Board of Review hears them separately as a quasi-judicial body. Filing at the Board does not require an Assessor appeal first. Most commercial cases are decided at the Board of Review stage.

Can I appeal my commercial assessment every year?

Yes. Cook County appeal windows open township by township every year, even outside reassessment years. An appeal corrects one year’s value, so owners with a persistent gap between assessment and market value often appeal annually.

What happens if the Board of Review denies my appeal?

The case can continue at the Illinois Property Tax Appeal Board, which reviews Board of Review decisions. In practice, the strength of the valuation evidence matters more at each rung, so the file built for the Board of Review keeps working.

Do commercial appeals raise taxes for homeowners?

They can shift some burden, because Illinois property taxes are levy-based. When one property’s assessed value falls, the same levy spreads across the remaining base. The counterpoint: a building taxed above its market value was overpaying, and accurate values on all properties are what make the split fair.

Does PahRoo file the appeal itself?

PahRoo provides the valuation side: preliminary opinions of value to screen properties, full USPAP-compliant appraisals, and testimony when a hearing needs it. Attorneys typically handle the filing and advocacy for commercial cases, and we work alongside them throughout.

Valuation Evidence for Cook County Appeals

PahRoo Appraisal & Consultancy has worked Cook County tax appeals for over two decades. An appraiser holding both MAI and SRA designations leads the firm. The work runs from portfolio screening through preliminary opinions of value to full appraisals and hearing testimony, for owners and for the attorneys who represent them.


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Vacant downtown Chicago office floor of the kind driving office tax appeals
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Property Tax
Chicago Office Tax Appeals While Values Trail Assessments

Here is a number the tax bill has not caught up with. In the second quarter of 2026, an office tower at 500 W Monroe sold again. The price came in at an estimated 76% discount to its prior sale. Downtown vacancy sits near 27%, absorption keeps running negative, and not one office building is under construction. So Chicago office tax appeals remain one of the clearest value plays in commercial real estate. After all, mass assessments move slower than markets fall. The gap between the two is where appeals get won.

By the end of this article, you’ll know:

  • Why downtown office assessments still trail the market, with current sourced numbers.
  • The three kinds of evidence that actually move the Board of Review.
  • How the annual appeal windows and the 2027 reassessment set your timeline.

Why Chicago Office Tax Appeals Keep Succeeding

Mass assessment prices thousands of buildings with models and lagging data. So it struggles most where markets move fastest. Downtown office is that place. Per CBRE’s second-quarter 2026 figures, direct vacancy reached 26.8%, up from 26.0% a year earlier. The market has absorbed roughly negative 2.2 million square feet since 2023, and nothing new is being built.

Now set an assessment against that reality. A model anchored to older rent rolls and pre-slump sales can overshoot. Then the building carries a value its actual income no longer supports. The owner pays taxes on a building that, in the market’s eyes, stopped existing. So the appeal is not a loophole. It is the mechanism for bringing the taxable value back to the evidence.

The Evidence That Moves the Board of Review

Winning appeals run on underwriting, not complaints. Three kinds of evidence carry the weight. First, income documentation: rent rolls, concession and free-rent packages, and occupancy history showing sustained loss rather than a bad quarter. Second, sales evidence: those six CBD transactions from the second quarter are comparable data. Also, a 76% discount at 500 W Monroe says more about downtown cap rates than any projection. Third, cost reality: deferred maintenance and the capital a building needs to compete reduce its net income and its value.

Each piece feeds the income approach, which is where commercial appeals live or die. We broke down how review bodies stress-test those inputs in our piece on NOI and cap rates under scrutiny. The short version: the Board of Review responds to numbers that look like a lender’s file. After all, those are the numbers the market actually uses.

Run the arithmetic on one building and the stakes get clear. Say a tower is assessed as if it were worth $80 million. Current income and sales support $50 million. In Cook County, most commercial property is assessed at 25% of market value, so that $30 million gap flows straight into the assessed value. Then the state equalizer and the local rate multiply it. For a single downtown tower, the difference can run to seven figures in annual taxes. For a portfolio holder with three such buildings, it is nowhere near a rounding error. That is why tax attorneys screen portfolios every season instead of waiting for a notice to arrive.

Appeals Run Every Year, and 2027 Raises the Stakes

Cook County appeals are not a one-time event. Windows open township by township each year, first at the Assessor and then at the Board of Review. So a missed season costs one year, not the case. The bigger date sits ahead. The City of Chicago gets reassessed in 2027 under the triennial cycle. Then every downtown office building receives a fresh value.

That makes the current period doubly useful. Evidence assembled now supports this year’s appeal, and the same file becomes the response to the 2027 notice. Owners who document income loss, sales comparables, and capital needs today walk into the reassessment with a case already built. Owners who wait will be assembling evidence while the clock runs.

Where a Preliminary Opinion of Value Fits

For attorneys, the practical question is which properties justify the fight. A preliminary opinion of value answers it before anyone commits to a full engagement. The prelim screens a property or a portfolio against current market evidence. Then it flags where the assessment-to-value gap is worth pursuing. Firms can request a preliminary review directly. Where the gap is real, a full USPAP-compliant appraisal carries the case at the hearing. Testimony stands behind it when needed.

Appeal on Underwriting, Not on Hope

The downtown office story will keep evolving, but the principle holds through every cycle. Assessments follow markets at a distance, and the distance is largest after a fall. So the owners and attorneys who win show up with the market’s own numbers. That means real income, real sales, real costs. Build that file once, use it twice, and let the evidence do the arguing.

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Frequently Asked Questions

Can I still appeal my Chicago office assessment?

Yes. Cook County appeal windows open township by township every year, first at the Assessor and then at the Board of Review. Missing one season costs a year, not the opportunity. Also, the City of Chicago’s 2027 reassessment will open a fresh round for every downtown property.

What evidence wins a commercial property tax appeal?

Evidence that reads like underwriting: rent rolls and concession data showing sustained income loss, plus recent comparable sales that reveal current cap rates. Documented capital needs that reduce net income round out the file. Review bodies respond to the same numbers lenders and buyers use.

How bad is the downtown Chicago office market right now?

Per CBRE’s second-quarter 2026 figures, direct vacancy reached 26.8% and year-to-date absorption ran about negative 500,000 square feet. Also, no office buildings were under construction. Among six CBD sales that quarter, 500 W Monroe traded at an estimated 76% discount to its prior price.

What is a preliminary opinion of value?

A screening analysis that estimates whether a property’s assessment meaningfully exceeds its supportable market value. It happens before anyone commits to a full appraisal. Tax attorneys use prelims to triage portfolios, pursuing the properties where the gap justifies the fight.

Does PahRoo support attorneys at the Board of Review?

Yes. PahRoo provides preliminary opinions of value for screening, full USPAP-compliant appraisals for the hearing, and testimony when cases require it. The work is built for scrutiny, which is what the Board of Review applies.

Evidence Built for the Board of Review

PahRoo Appraisal & Consultancy has worked Cook County tax appeals for over two decades. An appraiser holding both MAI and SRA designations leads the firm. The appeal work runs from portfolio screening to the hearing room. Maybe your matter needs a commercial appraisal with the income analysis attached. Maybe it spans broader appraisal services across an estate or dispute. Either way, the file arrives ready for the people who will try to pick it apart.


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