2023 Reassessments in Proviso Township

The Assessor's Office released its initial assessments of residential and commercial properties in Proviso Township on September 29, 2023.  The deadline to file an appeal is Monday, October 30, 2023. 

The Assessor’s Office follows a triennial reassessment cycle, which means one-third of the county is reassessed every three years. The townships scheduled for reassessment in 2023 can be found here. When a property is reassessed, the property owner is mailed a Reassessment Notice, which contains the property’s address, characteristics, and estimated Fair Market Value. The estimated Fair Market Value listed on the Reassessment Notice will be reflected on tax bills in 2024. 

Numbers at a Glance: Residential 

  • In 2022, median sale prices of single-family homes in Proviso Township were about $278K for single-family homes; $145K for condos; and $368K for small apartment buildings.

  • The Assessor’s Office estimated the 2023 median market value of single-family homes in Proviso Township is $240K, for condos the median market value is $122K, and is $312K for small apartment buildings. Estimates depend on the individual property’s location and characteristics.  

Residential Reassessment Report

Numbers at a Glance: Commercial

The chart below shows a high-level overview of the commercial properties in Proviso  Township.


Property TypePropertiesTotal Market Value
Hotels19$                     58,834,824 
Industrial543$                1,347,737,320 
Office189$                   349,709,223 
Other Commercial2$                           609,793 
Retail609$                   663,927,644 
Comm Condo20$                        7,075,375 
Multifamily - Affordable15$                     38,286,350 
Multifamily - Market270$                   546,141,046 
Auto Dealership10$                     43,246,286 
Auto Repair94$                     41,053,723 
Bank32$                     40,871,439 
Bowling Alley3$                        4,020,771 
Carwash11$                        5,521,768 
Gas Stations / Convenience54$                     51,637,872 
Office/Warehouse1$                           820,809 
Self Storage12$                     51,596,402 
Used Car Lot9$                        3,115,160 
Gas Station/ Cstorewgas1$                           310,399 
Nursing Home6$                     62,653,100 
Total1,900$        3,317,169,304 

Commercial Reassessment Report

Appealing Property Assessments

If the property characteristics listed on an assessment notice are incorrect, or if the estimated market value of a property is significantly more than what it could sell for in the current real estate market, property owners should consider filing an appeal.

Appeals for Proviso Township can be filed until Monday, October 30, 2023. More information can be found at cookcountyassessor.com/appeals. To learn more about property assessments and appeals, join the Assessor’s Office at a virtual event and download this helpful guide.

Changes in Assessed Value in Proviso Township 

Because of increases in the value and/or number of properties throughout Proviso, the total assessed value of the township grew 35%. The following table shows the increase in total assessed value in residential and non-residential properties in Proviso Township.

Property Group 

2022 (Board of Review Final) 

2023 (pre-CCAO appeals, pre-Board of Review) 

Change in total Assessed Value 

(Class 2) 



$274.73M (30%) 

Large Multifamily (Class 3)



$20.55M (60%)

Standalone Commercial 
(Class 5A)



$81.68M (31%)

(Class 5B)



$98.28M (70%)

(Class 4)



$0.25M (17%)

All Others 
(Vacant, Incentive, and Exempt) 



$14.03M (40%) 




$489.52M (35%) 

If the percentage increase of a Proviso property’s individual assessment went up less than the total assessed value of 35%, the property could see little change in its property tax bill or even a decline. The full impact of this reassessment on tax bills will be known in late 2024 after all appeals are processed and exemptions are applied.

How Assessments Relate to Property Taxes 

Assessments, under Illinois law, should fairly reflect market values. The Assessor’s Office estimates market values by using a mass appraisal model that analyzes sales trends. Mass appraisal models rely on accurate data. If a property owner believes the characteristics listed for their property are inaccurate, or their property is worth less than the Assessor’s Office’s estimate of its value, the owner is entitled to file an appeal.

These assessments divide up the total tax levy of that property’s township, school district, and other taxing districts. A property owner’s share of taxes depends on how their property’s assessment relative to the total assessed value of their area. Therefore, an increase in a property's assessment does not lead to the same increase its tax bill.

Tax levies pay for services such as schools, parks, libraries, and pensions. The Assessor does not set levies or tax rates. Increases in assessments do not increase the revenue received by taxing districts.

Receive Property Tax Assistance | Proviso

Join us for a workshop to learn about recent reassessments in Proviso Township.

  • Understand your assessment notice
  • How to determine if an appeal should be filed
  • Learn how to file for an appeal
  • Participate in live Q & A session
2023 proviso township virtual appeal workshop in english