Sample property-tax appeal dossier
See the recommendation, comparable evidence, assessment history, filing narrative, and walkthrough Censum packages for a homeowner, using privacy-safe sample data.
Sample
Cook County residential property tax appeal dossier generated from public assessment records, Board of Review outcome history, and parcel-level review signals. This dossier summarizes what to verify before preparing a county or Board of Review submission.
1Property Summary
2Censum Recommendation
Recommended action: File the uniformity appeal. Focus the filing on Assessment history: current mailed AV $121,672; recent change +33.6%; available lookback change +300.9%. Attach comparable-property evidence, sale/appraisal support, photos, or condition notes. Current evidence status: Uniformity: verified and ready; market value: research leads only.
Uniformity appeal
Recent sales don't show enough overvaluation to add a market-value case, so the plan focuses uniformity - with a second bite at the Board if the Assessor denies.
- A standard residential appeal does not raise your assessment.
- Add a recent sale or appraisal and a market-value (overvaluation) lane could open at the Board.
3Uniformity Comparables
Similar nearby properties assessed lower than yours - the lack-of-uniformity evidence for the Assessor.
"Realized win rate" is how often appeals like yours - your township, property type, filed pro se - have won a reduction at the Board historically. It is a segment rate, not a per-property prediction or a guarantee.
| Address | PIN | Assessed | $/sqft | Sq ft | Yr |
|---|---|---|---|---|---|
| 1318 REID ST | 18064060150000 | $103,238 | $28.08 | 3,677 | 2002 |
| 3906 GRAND AVE | 18062040140000 | $99,172 | $29.05 | 3,414 | 2010 |
| 4309 LAWN AVE | 18064050030000 | $106,000 | $28.39 | 3,734 | 1997 |
| 1329 WALNUT ST | 18064060020000 | $108,194 | $29.07 | 3,722 | 2004 |
| 1247 WALNUT ST | 18064090010000 | $91,001 | $24.47 | 3,719 | 2001 |
Subject vs. comparables - specs
Side-by-side property characteristics so the Assessor can see the subject is assessed higher than similar-spec comparables. Verify each comp's similarity before filing.
| Spec | Subject | Comp 1 | Comp 2 | Comp 3 | Comp 4 | Comp 5 |
|---|---|---|---|---|---|---|
| Sq ft | 3,732 | 3,677 | 3,414 | 3,734 | 3,722 | 3,719 |
| Beds | 4 | 4 | 5 | 5 | 4 | 4 |
| Baths | 4.5 | 3.5 | 3.5 | 3.5 | 4.5 | 3.5 |
| Year built | 2001 | 2002 | 2010 | 1997 | 2004 | 2001 |
| Exterior | Frame | Masonry | Frame | Masonry | Masonry | Frame |
| Garage | 2.5 cars | 3 cars | 2 cars | 2.5 cars | 3 cars | 2 cars |
| Assessed $/sqft | $32.60 | $28.08 | $29.05 | $28.39 | $29.07 | $24.47 |
4Market-Value (Overvaluation) Estimate
This is the market-value lane, separate from the uniformity comparison above. Your assessment looks higher than what similar nearby homes have recently sold for. The "typical" figure reflects what comparable Board of Review appeals actually won; the "best case" uses the strongest defensible comparable sales. These are estimates of possible savings, not a guarantee.
| Market-value finding | Detail |
|---|---|
| Assessment vs. market | About 0% above recent sales of similar nearby homes |
| Based on | 5 comparable recent sales in your neighborhood |
| Typical reduction | ~$0/yr at ~52% odds (what comparable Board appeals actually won) |
| Best case | ~$0/yr if the strongest comparable evidence holds |
| PIN | Sale price | Sale date | $/sqft | Sq ft | Yr |
|---|---|---|---|---|---|
| 18062200090000 | $920,000 | 2022-06-13 | $257.63 | 3,571 | 1998 |
| 18062020070000 | $1,015,000 | 2022-07-20 | $303.53 | 3,344 | 1998 |
| 18062020150000 | $1,260,000 | 2023-12-04 | $349.81 | 3,602 | 2007 |
| 18063040250000 | $1,084,000 | 2025-07-16 | $353.79 | 3,064 | 1993 |
| 18063050200000 | $1,151,000 | 2023-06-01 | $357.23 | 3,222 | 2002 |
5Assessment History
Key read: latest mailed assessed value is N/A. Recent change vs. prior year: +33.6%. Change over the available lookback: +300.9%. Large step-ups, class changes, or unusual year-over-year moves are the first items to review in an appeal.
| Year | Class | Mailed Total | YoY Change | Notes |
|---|---|---|---|---|
| 2026 | 278 | - | - | |
| 2025 | 278 | $121,672 | +33.6% | |
| 2024 | 278 | $91,058 | -18.0% | |
| 2023 | 278 | $111,000 | +36.8% | |
| 2022 | 278 | $81,113 | +0.0% | |
| 2021 | 278 | $81,113 | -8.4% | |
| 2020 | 278 | $88,584 | +9.8% | |
| 2019 | 278 | $80,708 | -6.3% | |
| 2018 | 278 | $86,160 | -9.6% | |
| 2017 | 278 | $95,292 | +19.1% | |
| 2016 | 278 | $80,041 | +0.0% | |
| 2015 | 278 | $80,041 | -10.8% | |
| 2014 | 278 | $89,685 | +0.2% | |
| 2013 | 278 | $89,502 | +0.0% | |
| 2012 | 278 | $89,502 | +0.0% | |
| 2011 | 278 | $89,502 | -7.3% | |
| 2010 | 278 | $96,522 | +0.0% | |
| 2009 | 278 | $96,522 | -7.0% | |
| 2008 | 278 | $103,788 | +27.6% | |
| 2007 | 278 | $81,357 | +0.0% | |
| 2006 | 278 | $81,357 | +0.0% | |
| 2005 | 278 | $81,357 | +41.9% | |
| 2004 | 278 | $57,332 | +12.3% | |
| 2003 | 278 | $51,037 | +31.6% | Class changed |
| 2002 | 205 | $38,779 | +27.8% | |
| 2001 | 205 | $30,353 | +0.0% | |
| 2000 | 205 | $30,353 | +0.0% | |
| 1999 | 205 | $30,353 | - |
6Class Change Explanation
Cook County property class codes categorize parcel use and assessment treatment, so a class change can change which properties should be compared against the subject. This record is currently 278 - Cook County class code 278. The available history shows 205 - Two-story residence, any age -> 278 - Cook County class code 278. That may be perfectly legitimate, but it is a filing review item because a stale or incorrect class/use code can make the assessment non-uniform with the right comparison set. If the current class does not match the property's actual use, attach proof such as deed/condominium documents, occupancy facts, photos, closing documents, or Assessor property details.
| From | To | What changed |
|---|---|---|
| 2002 | 2003 | 205 - Two-story residence, any age -> 278 - Cook County class code 278 |
7Why This Property Is Worth Appealing
Your assessment spiked, and comparable homes nearby are assessed lower — here is the case at a glance. Censum has already assembled the comparable evidence and the exact appeal narrative; your part is to review and file.
The gap between the bars is your estimated over-assessment — about $9,087 in assessed value.
Estimates are derived from public records and comparable assessments; they are not a guarantee of any county or Board of Review decision.
8Exact Appeal Narrative
This is your appeal statement — paste it directly into your CCAO or Board of Review appeal application and submit as written. It is drafted in your voice as the appellant; it is the text the county reads, not guidance to you.
9Suggested Supplementary Evidence
Censum has already assembled your comparable evidence (comps, assessed values, photos, and parcel imagery). The items below are optional supplements — if you have information specific to your property, adding it can strengthen the case. You are not required to gather these; they only help if you already have them.
| Category | Censum suggestion | What to attach |
|---|---|---|
| Uniformity comps | Use the Censum Research Leads as starting points, then verify 3 to 5 nearby homes in the same neighborhood and class with similar size, age, construction, and condition. Include PINs, addresses, assessed values, and photos when possible. | 3 to 5 verified lower-assessed similar properties/units with PINs, addresses, assessed values, and photos. |
| Market / overvaluation | If the owner has a recent arms-length sale, closing statement, appraisal, or broker-supported sale evidence below the implied market value, attach it. A recent sale or closing statement is the primary support for overvaluation. | Closing statement, purchase contract, recent appraisal, or similar recent sales evidence. |
| Property-record issues | Cook County property class codes categorize parcel use and assessment treatment, so a class change can change which properties should be compared against the subject. This record is currently 278 - Cook County class code 278. The available history shows 205 - Two-story residence, any age -> 278 - Cook County class code 278. That may be perfectly legitimate, but it is a filing review item because a stale or incorrect class/use code can make the assessment non-uniform with the right comparison set. If the current class does not match the property's actual use, attach proof such as deed/condominium documents, occupancy facts, photos, closing documents, or Assessor property details. | Assessor property details, deed/condo docs, square footage proof, photos, repair estimates, occupancy or vacancy proof. |
| Photos / condition | Photos make the filing easier to understand. The Board specifically values orderly evidence; front photos of the subject are important and comp photos help. | Dated subject photo, comparable-property photos, interior condition photos, repair estimates, inspection notes. |
| Filing representation | Individual homeowners may generally file for themselves. If title is held by an LLC, corporation, condominium association, or similar entity, attorney representation may be required. | If attorney representation is required or desired, use a licensed attorney rather than a pro se filing. |
10Official Evidence Guide
Censum has already built your evidence to these Cook County standards — the comps, assessed values, photos, and parcel imagery in this dossier follow the rules below. This guide is here so you can review that evidence with confidence; it is not a to-do list.
| Topic | Cook County standard (applied by Censum) |
|---|---|
| Uniformity | Use similar properties with lower assessments. For houses, start on the same block or one to two blocks away inside the neighborhood. For condos, start with same-building units. |
| Comparable quality | Pick properties similar in class, size, age, construction, materials, and condition. Very different homes/units are weak evidence. |
| Condo parking | For condo sales, verify whether separately taxed parking is included or excluded before treating a sale as a clean unit comparable. |
| Evidence package | Attach addresses, PINs, assessed values, and photos when available. Keep the evidence orderly and easy for an analyst to review. |
| Overvaluation | Use a recent sale, closing statement, appraisal, or sales of similar homes/units to show market value below the assessment. |
| Incorrect facts | Attach proof for wrong square footage, class, condition, vacancy, damage, unit details, or other record errors. |
| Representation | Individual homeowners may file for themselves. Entities such as corporations, LLCs, and condominium associations must be represented by an attorney before the Board of Review. |
Official sources checked: Cook County Board of Review residential appeals and lack-of-uniformity guidance, Cook County Board of Review portal guidance, Cook County Assessor classification guidance, and the Board of Review official rules.
11Evidence Checklist
| Evidence | Why it matters | Where to get it | What to attach |
|---|---|---|---|
| Comparable properties | Primary support for lack of uniformity; it shows similar properties are assessed lower. | Start with Censum Research Leads, then verify on the Cook County Assessor property search and the Board/Assessor comparable tools. | 3 to 5 similar properties or condo units, with PINs, addresses, assessed values, and photos if available. |
| Recent sale or closing statement | Primary support for overvaluation; it can show market value below the assessment-implied value. | Owner closing package, deed, purchase contract, attorney file, title company, or recorded sale data. | Closing statement, purchase contract, deed, or recent sales of similar homes/units. |
| Appraisal | A credible appraisal can anchor market value when the assessment is above market. | Owner's lender file, refinance file, or a new appraisal if the value gap justifies the cost. | Recent appraisal; official rules may require USPAP-compliant appraisals. |
| Photos / condition notes | Photos make facts easy to understand and can explain why a property should be valued below otherwise similar properties. | Owner phone photos, inspection reports, repair estimates, contractor bids, vacancy/damage records. | Dated exterior/interior photos, repair estimates, inspection notes, damage or vacancy evidence. |
| Property record corrections | Incorrect characteristics can drive an inflated assessment or the wrong comparison set. | Cook County Assessor property detail page, deed/condo documents, survey, floor plan, building permit, inspection records. | Proof of square footage, unit details, property class, building condition, or demolition/vacancy facts. |
12Censum Research Leads
These are not automatic comparables. They are same-township/class launch-candidate starting points with lower assessed values. Censum includes last-sale fields when they exist in the launch data, but blanks mean Censum did not have a verified sale in this database at generation time. Verify building, unit, location, size, condition, sale facts, and photos before using any lead in an appeal.
| PIN | Address | AV | Tax / nbhd | Why selected |
|---|---|---|---|---|
| 18064060150000 | 1318 REID ST | $103,238 | 21 / 21012 | Lower AV; same neighborhood/class. Verify similarity before filing. |
| 18062040140000 | 3906 GRAND AVE | $99,172 | 21 / 21012 | Lower AV; same neighborhood/class. Verify similarity before filing. |
| 18064050030000 | 4309 LAWN AVE | $106,000 | 21 / 21012 | Lower AV; same neighborhood/class. Verify similarity before filing. |
| 18064060020000 | 1329 WALNUT ST | $108,194 | 21 / 21012 | Lower AV; same neighborhood/class. Verify similarity before filing. |
| 18064090010000 | 1247 WALNUT ST | $91,001 | 21 / 21012 | Lower AV; same neighborhood/class. Verify similarity before filing. |
13Parcel Boundary Imagery
Cook County 2025 aerial imagery is shown with a high-visibility GIS parcel boundary overlay. Use this as visual context for the subject and candidate comps; it is not a legal survey or a substitute for comparable-property evidence.
Each property's actual Cook County 2025 aerial with the GIS parcel-boundary overlay (subject and comparables). Cook County open GIS imagery and local parcel geometry. Parcel boundaries are approximate visual guides from GIS geometry, not legal surveys.
14Property Visuals
Subject and comp visuals are shown together. Censum uses official Cook County Assessor photos when available; when an official photo is missing, the client dossier shows the case-specific fallback visual or research lane and keeps client signoff status visible before any submission.
Official Cook County Assessor photos for the subject and each comparable shown above. Treat each comparable photo as a starting point and verify similarity before filing.
15Client Visual Research Links
Use these links as a client-only photo review starting point. Zillow is the first fallback source when official photos are unavailable, but any suggested listing-site visual must still be accepted, replaced, or excluded by the client before it is treated as submission-ready.
Open-in-new-tab research links for this property. Treat listing-site photos as starting points; accept, replace, or exclude each before it is submission-ready.
16Board Website Filing Walkthrough
Use this as the filing sequence. The Board portal changes over time, but the public Board site currently directs owners through the BOR Portal Login / Submit an Appeal links and the Property Owner portal guide steps shown below.
| Step | Action |
|---|---|
| 1 | Go to cookcountyboardofreview.com and choose BOR Portal Login or Submit an Appeal. |
| 2 | Create or sign into the portal account, then click Submit Appeal. |
| 3 | Choose Property Over Assessment. If filing a single PIN, add only the subject PIN and answer no for associated PINs. |
| 4 | Select overvaluation and/or lack of uniformity as the reason, plus property-record correction if facts are wrong. |
| 5 | Paste the Board-facing narrative from this packet into the explanation field. |
| 6 | Attach comparable-property evidence, sale/appraisal documents, and photos or condition notes. |
| 7 | File during the township's Board of Review window, save the confirmation number, and watch for Board follow-up. |
This walkthrough covers the Board of Review filing window. The Assessor (CCAO) stage is a separate, earlier window with its own portal; use the same packet evidence if you choose to file at that stage as well.
17Definitions
Use this page to keep filing terms plain. The Board of Review does not need Censum internal language; the filing should explain the facts and attach support.
| Term | Plain-English definition |
|---|---|
| Property class | Cook County's code for property type/use. Class changes can be normal, but should be reviewed when they coincide with a valuation jump. |
| Mailed assessed value / Current AV | The assessed value shown in the assessment data. For Class 2 residential property, market value is often approximated as AV divided by 10%. |
| Overvaluation | An appeal argument that the assessed value is too high compared with market evidence. |
| Lack of uniformity | An appeal argument that similar properties are assessed lower. |
| Comparable property | A similar property or condo unit used to support overvaluation or lack of uniformity. |
| Property-record correction | A factual correction, such as wrong class, size, unit facts, condition, vacancy, or building characteristics. |
| BOR window | The Board of Review filing period for the township. |
| PIN (Property Index Number) | The 14-digit Cook County parcel ID. Your assessment, exemptions, appeals, and tax bill are all tied to it. |
| CCAO (Cook County Assessor) | The Cook County Assessor's Office sets your assessed value and is the first place you can appeal each year. |
| Board of Review (BOR) | A separate county board and the second place to appeal. It reviews independently, and its decision supersedes the Assessor's. |
| Equalized Assessed Value (EAV) | Your assessed value multiplied by the state equalization factor. Exemptions are subtracted from it before the tax rate is applied. |
| State equalization factor | An annual statewide multiplier that converts assessed value into equalized assessed value (EAV). |
| Exemption | A reduction to your taxable value (Homeowner, Senior, and others). It lowers the bill directly and is separate from an assessment appeal. |
| Arm's-length sale | A sale between unrelated parties under normal market conditions - the strongest evidence of market value. |
| Second-Installment tax bill | Cook County's later (fall) bill, where the final tax rate, equalizer, exemptions, and any appeal reduction are reflected. |
| Triennial reassessment | Cook County reassesses each township once every three years. Your reassessment year is when values most commonly change. |
| Certificate of Error | A path to correct certain factual or exemption errors on an already-issued bill, outside the normal appeal window. |
18Data Appendix
This packet uses the Censum data available at generation time: public parcel identity, assessment history, appeal calendar, comparable-property leads, official public imagery, and owner-provided evidence when available. Censum is a data and analytics service, not a law firm. Packet contents do not guarantee any appeal outcome, tax savings, or Board decision.
19Official Reference Links
| Source | Link |
|---|---|
| Cook County Board of Review residential appeals | cookcountyboardofreview.com/residential-appeals |
| Board guide: lack of uniformity | how-present-case-based-lack-uniformity |
| Cook County Board of Review portal guide | portal-guide-property-owners |
| Cook County Assessor classification codes | classifications-real-property |
| Cook County Board of Review official rules | board-review-official-rules |
20What Would Make This Stronger
Best next evidence: a recent arms-length sale below the implied market value, photos showing condition issues, a recent appraisal, and verified comparable properties assessed or sold lower than the subject. If you have any of those, attach them to the filing.
Cook County allows two independent residential appeals each year - a uniformity review at the Assessor, then a valuation review at the Board of Review, whose decision supersedes the Assessor's. A standard residential appeal does not raise your assessment; reductions apply to your Second-Installment tax bill. Censum is a data service, not a law firm, and does not guarantee any specific reduction. Estimates are derived from public assessment records and recent sales.
No real homeowner exposure.
This sample uses a fabricated owner, address, and PIN. Real homeowner details are never published in a public preview.
It is not an outcome promise.
The dossier helps you decide whether the evidence is worth filing. The county decides the result.
Censum is not a law firm.
Censum provides research and decision support, not legal representation. You file your own appeal using the packet.
Built for review, not hype.
Censum keeps public claims tied to live product behavior, public data sources, and sample packet evidence.
- Modeled tier and recommended pricing path
- Comparable properties and assessment history
- Top drivers behind the packet recommendation
- No guaranteed reductions or refunds
- No county or government affiliation
- No legal or tax advice
Censum is an independent property-tax analytics service. Public sample pages are illustrative and privacy-safe. Actual packet contents depend on property type, township, available public records, appeal window, and model eligibility checks.
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