Comps packets for every PIN, in minutes.
Send your PINs. Get a Board of Review uniformity brief for each.
| Property | Distance | Improvement / sq ft |
|---|---|---|
| Subject | 0.00 mi | $33.05 |
| Comp 1 | 0.18 mi | $26.24 |
| Comp 2 | 0.06 mi | $25.37 |
| Comp 3 | 0.02 mi | $24.14 |
| Comp 4 | 0.14 mi | $22.41 |
| Comp 5 | 0.20 mi | $23.09 |
The same appeal, two ways.
By hand
- Look up the neighborhood and class
- Pull a dozen similar homes
- Pick five and copy them into a grid
- Check the subject’s recorded sales
- Type the brief
About 20 minutes a PIN (our estimate), inside a window open roughly 30 days.
With PIN to Packet
- Send the PIN list
- Review each packet
- Sign and file
The legwork comes back done.
What comes back for each PIN.
Download the sample brief (PDF)Lack-of-uniformity brief
The requested assessment worked out to the dollar, with Rule 18 sales and a Rule 16 signature block.
Exhibit A comps grid
Five similar homes in PTAB-1A Section V order, chosen on the Assessor’s comp factors.
Exhibit C checklist
What your office still adds before filing: photos, argument, signature.
Internal triage sheet
Not for filing. Strong, possible or weak, with the reason in one line.
How its flags held up last year.
Run on 32,273 residential appeals from tax year 2025, using only pre-Board values.
| Township | All appealed | Flagged strong or possible |
|---|---|---|
| Hanover | 46% | 82% |
| Niles | 56% | 92% |
| Schaumburg | 57% | 93% |
| Wheeling | 54% | 92% |
Source: Board of Review decisions. A look back, not a prediction.
What you’d ask before sending PINs.
Who files the appeal?
You do. Your attorneys review, sign and file. The tool gives no legal advice.
Where does the data come from?
Cook County’s open data: Assessor values, characteristics and recorded sales. Each brief names its datasets.
What happens to our PINs?
Used only to build your packets, never shared or sold. No client names needed.
What does it cost?
The pilot is free. Then a flat software fee, never a share of savings or fees (Illinois RPC 5.4).
Who’s behind it?
Peter Piekarczyk, a software developer in Arlington Heights.
Send 5 PINs. Packets back in 24 hours.
Free. The first 3 firms that sign on get 50% off, locked for two seasons.