2023 Reassessments in Lemont Township

The Assessor's Office released its initial assessments of residential and commercial properties in Lemont Township on May 9, 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 Lemont Township were about $475K for single-family homes, $199K for condos, and $300K for small apartment buildings.   

  • The Assessor’s Office estimated the 2023 median market value of single-family homes in Lemont Township is $493K, for condos is $199K, and $317K 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 Lemont Township.


Property TypePropertiesTotal Market Value
Medical Office1$                        655,351 
Office12$                  20,401,698 
Professional Office2$                    1,677,319 
Retail62$                110,448,205 
Comm Condo62$                  12,631,581 
Multifamily - Market17$                  23,760,725 
Auto Repair10$                    9,199,858 
Bank8$                  11,429,144 
Bowling Alley1$                    1,746,580 
Car Wash2$                    2,233,954 
Department Store2$                  14,796,170 
Hotels3$                    2,729,246 
Leasehold1$                        377,105 
Utility2$                        257,058 
Gas Stations / Convenience12$                  17,979,943 
Gas Station/ Convenience Store with Gas Station6$                    6,832,090 
Industrial40$                  94,191,057 
Nursing Home2$                  39,060,817 
Residential Treatment Center1$                  18,204,375 
TOTAL246$                388,612,276 

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 Lemont Township can be filed until June 9, 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 Lemont Township 

Because of increases in the value and/or number of properties throughout Lemont, the total assessed value of the township grew 39%. The following table shows the increase in total assessed value in residential and non-residential properties in Lemont Township.

Property Group 

2022 (Board of Review Final) 

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

Change in total Assessed Value 

(Class 2) 



$107.50M (37%) 

Large Multifamily (Class 3)



$0.25M (13%)

Standalone Commercial 
(Class 5A)



$18.82M (39%)

(Class 5B)



$11.07M (91%)

(Class 4)



$0.29M (142%)

All Others 
(Vacant, Incentive, and Exempt) 



$2.43M (36%) 




$140.35M (39%) 

If the percentage increase of a Lemont property’s individual assessment went up less than the total assessed value of 39%, 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 | Lemont

Watch a virtual workshop to learn about recent reassessments in Lemont

  • Understand your reassessment notice and how to determine if an appeal should be filed
  • Learn how to file for missing exemptions
  • Participate in a live Q&A session