Melrose Park homeowners have until October 27, 2026 to appeal the value printed on the Cook County Assessor's reassessment notice. That leaves 23 days from today. The notices went out to all of Proviso Township on September 14, 2026, and the value on them will show up on tax bills in 2027. Most owners will look at one number on the notice, see that it went up, and either worry or shrug.
That number on its own doesn't tell you much. How much your value rose matters less than how it rose compared with everyone else who shares your taxing districts. The Assessor's own township figures show one property type pulling well ahead of the others this cycle, and that type is condos.
One note on scope before the numbers. The Assessor reports at the township level, so every figure below covers all of Proviso Township, which includes Melrose Park. No Melrose Park-only figure has been published.
Three property types, three different trends
The Assessor's office publishes a short table for each township it reassesses. Put the 2023 table next to the 2026 one and the gap is clear.
| Proviso Township | 2023 Assessor median estimate | 2026 Assessor median estimate | Change in median estimate |
|---|---|---|---|
| Single-family homes | $240K | $286K | about 19% |
| Condos | $122K | $172K | about 41% |
| Small apartment buildings | $312K | $379K | about 21.5% |
Single-family homes and small apartment buildings moved roughly together. The median condo estimate rose about twice as fast. These are changes between township medians, not the same properties tracked from one cycle to the next. Still, a gap that wide across a whole township is hard to dismiss as noise.
Where the estimates sit against what actually sold
The second test is how the Assessor's estimates compare with real sale prices. Both reassessment reports print the two side by side.
In 2023, the Assessor's medians came in below the prior year's median sale prices for all three types. Single-family homes were estimated at $240K against roughly $278K in 2022 sales. Condos were $122K against $145K, and small apartment buildings were $312K against $368K. All three estimates landed at about 84 to 88 percent of the sale median.
For 2026, single-family and small apartment buildings stayed in that same range. The median single-family estimate is $286K against a 2025 median sale price of $326K. Small apartment buildings are estimated at $379K against $449K in sales. Condos changed. The 2026 condo estimate is $172K, and the 2025 median condo sale price is $155K. The condo estimate went from about 84 percent of the sale median to about 111 percent.
There is a real caveat here. A sale median only counts homes that sold. The Assessor's median covers every home in the township. If the condos that sold in 2025 were mostly smaller or older units, the two medians would split apart even if every individual estimate were accurate. So treat the condo comparison as a signal, not proof that any particular unit is overvalued. Even so, it is the only property type in Proviso where the signal points this way.
Why your share matters more than your increase
The Assessor's 2023 Proviso report explains how this works in one sentence. That cycle, the total assessed value of the township grew 35 percent, and the report said that if a property's own assessment went up by less than that, the owner "could see little change in its property tax bill or even a decline."
Your bill is your slice of what local taxing districts levy. If every property's value jumps by the same percentage, the slices stay the same size. The Assessor says the same thing about 2026: a change in value alone can't predict a bill, because each property's tax depends on its share of assessed value within each district.
Look at the 2023 breakdown again with that in mind. Residential Class 2 property grew 30 percent, industrial grew 70 percent and standalone commercial grew 31 percent. Different classes moving at different speeds is exactly how the tax burden shifts. The 2026 total assessed value change for Proviso hasn't been published in the reports reviewed here. Within the residential numbers that are available, though, the median condo estimate moved fastest. Those are township medians, so they can't tell any one owner what happened to their own share. A condo owner who wants to know should compare the percentage change on their own notice with the changes on comparable properties in the same taxing districts.
How the notice value becomes a bill
The Assessor spells out the chain on the Proviso page, and it is short.
- Assessed value. Homes, condos and other 200-class property are assessed at 10 percent of estimated market value. A $500,000 home has a $50,000 assessed value.
- Equalized assessed value. The Illinois Department of Revenue sets one multiplier, called the equalizer, for all of Cook County each year. The Assessor's illustration uses 3.0, which turns $50,000 into $150,000.
- Exemptions. Fixed amounts come off the top. The Homeowner Exemption removes $10,000 of EAV and the Senior Exemption removes $8,000. The tax rate is applied to what's left.
Exemptions are fixed dollar amounts, not percentages, and that matters for condos in particular. On a lower-value unit, a $10,000 exemption removes a larger share of the taxable value. When a condo's estimate jumps, that cushion covers less of it. The equalizer and the exemptions are the same countywide. An appeal goes after what's on the notice itself, meaning the estimated value and the property details behind it.
When an appeal is worth filing
The Assessor's office gives a rule of thumb. If the property details on your notice are correct and the estimated market value is within 10 percent of what you think the home is worth, an appeal probably won't change the bill much. That test applies to your own unit, not the township. The roughly 11 percent gap between the condo medians says nothing about any single condo, but it gives condo owners reason to run the comparison for their own unit.
The office lists three grounds for appeal:
- Lack of uniformity. Your assessed value is out of line with comparable properties. In a condo building, the units next door are the obvious comparison.
- Overvaluation. You can submit a recent closing statement or the purchase prices of similar homes.
- Incorrect property description. Wrong square footage, wrong classification, or another error that affects value. The Assessor adds that a minor error doesn't necessarily mean the assessment is wrong.
If you bought recently, don't expect your notice to match your purchase price. The Assessor deliberately avoids setting values equal to recent sales, which it calls "sales chasing," because doing that favors areas with high turnover. Your closing statement can still go in as evidence. And if your building had few sales, the model drew on nine years of sales across Cook County.
The October calendar for Proviso owners
Appeals are free, can be filed online, and don't require a lawyer. Here is what's on the calendar this month:
- Tuesday, October 6, 5 to 7 p.m. The Cook County Assessor's Office holds one-on-one help at Sheet Metal Workers Union Hall, 4550 Roosevelt Rd., Hillside. Staff will review your notice, talk through whether an appeal makes sense, and help you file.
- Wednesday, October 7, 6 p.m. English virtual workshop with live Q&A.
- Thursday, October 8, 6 p.m. Spanish virtual workshop with live Q&A.
- Tuesday, October 27. Deadline for residential appeals to the Assessor for Proviso Township.
There is also a local office for year-round help. The Proviso Township Assessor's Office is at 4565 W. Harrison Street in Hillside, 708-449-4304. It describes itself as a local property-tax advocate and helps residents file appeals with both the Cook County Assessor and the Board of Review.
FAQ
My value went up. Does that mean my taxes will too? Not necessarily. The Assessor's 2023 Proviso report said owners whose increase came in below the township's overall growth could see little change or even a lower bill. What matters is your share.
When does the 2026 value reach my bill? On tax bills issued in 2027.
What if I miss October 27? The Cook County Board of Review is a separate, free second level of appeal. It posts township deadlines once they're set. As of today, Proviso is listed as a pre-file township with no filing dates posted yet.
I own a commercial property in Melrose Park. Is my deadline also October 27? Confirm it with the Assessor directly. The Proviso commercial page lists October 15, 2026, which conflicts with the countywide calendar.
Nothing here is tax or legal advice. It's how the system works, laid out so you can read your own notice with clear eyes.
An overvaluation appeal is only as good as the sales you attach to it. If your Melrose Park condo, house or two-flat came back with a number that looks high, Francesco Campobasso will pull the comparable sales and tell you plainly what your property would sell for today, so you know whether you have a case before October 27. Get Your Free Home Valuation.
