Assessor Services

“Oak Park Township Assessor Services can answer many questions on real estate assessment and property tax bills. Property values are determined by the Cook County Assessor’s office.”

Assessor Updates

Second Installment Tax Bills and Reassessment Impact

Second Installment Tax Bills bring Shifts to Oak Park's Tax Burden

Contact Person: Ali ElSaffar, Oak Park Township Assessor
(708) 383-8005

The second installment tax bills that arrived in late August are the first to reflect the 2020 reassessment of Oak Park properties.  Combined, these tax bills seek a total of $230 million from Oak Park properties, an amount 3.2% higher than last year.  Because of the reassessment, however, the tax changes for most individual property owners do not match the increase in tax bills for the community as a whole.

When property values are reassessed, each property’s share of the community tax burden changes, with some properties seeing dramatic tax increases, others experiencing moderate tax growth, and some getting tax reductions. The variations in tax bills associated with the 2020 reassessment are noteworthy because they shifted the tax burden between business and residential properties. 

This year, the combined tax bill for Oak Park’s residential properties—single-family homes, condominiums and two- to six-flats—fell by about 1%.  This decline was offset by increases in business taxes, with large apartment buildings (properties with seven units or more) paying 47% more compared to last year, and commercial buildings paying 5% more.  The changes from all sectors of the tax base add up to Oak Park’s overall tax increase of 3.2%.

Why did the taxes on large apartment buildings increase by 47%?   There are two main reasons for this.  First, the assessed values on existing large apartment buildings increased significantly, resulting in a median tax increase of 26%.  The big assessment increases are the result of an effort to comply with a county ordinance requiring large apartment buildings to be assessed at 10% of market value.  Over the last several years, the Illinois Department of Revenue’s annual comparisons of sale prices to assessed values indicated that large apartment buildings were being assessed at about 7% of market value.

The remaining increase in apartment taxes comes from several new apartment buildings that came onto the tax rolls in 2020, including two large buildings in downtown Oak Park—the Albion building at Lake and Forest and the Eleven33 building at South Boulevard and Harlem.  County records indicate that the new apartment buildings were not fully occupied in 2020, but even at partial occupancy they generated more than $2 million in new property tax revenue for the community.

Why did the taxes on residential properties fall by 1%?  The decline in taxes on residential properties occurred because the assessed values of Oak Park’s residential properties did not rise as fast as the assessed values of business properties.   This resulted in an increase in the business share of Oak Park’s tax burden and a corresponding decline in the residential share. 

Did all homes, condominiums and small apartment buildings experience 1% tax reductions? No.  Although taxes declined on residential properties as a group, there is wide variation within the group.  A majority of residential properties had tax reductions, but about one in five experienced double-digit tax increases, and around 8% had tax increases greater than 25%.

Will the decline in the residential share of the tax burden be permanent?  Although no one can predict the future, the property tax system’s response to the pandemic provides reason to believe that at least part of the shift in the tax burden may be temporary.  When Oak Park’s new assessed values were issued in February of 2020, efforts were made to ensure that they accurately reflected market values.  When the pandemic hit, however, it was assumed that residential property values would fall, and the original assessed values were reduced by 8%-12%.

But most of the anticipated declines in market value did not materialize.  If the housing market remains strong when the pandemic-related adjustments disappear at Oak Park’s next reassessment in 2023, large increases in residential assessments may be needed to accurately reflect the market.  This could result in an increase in the residential share of the tax burden. 

Why did Oak Park’s tax levies increase by 3.2%?  The tax cap law limits most governing bodies to inflation-level tax increases on existing properties, but allows for additional revenue from new properties.  Among the Oak Park districts, School District 97’s increase of 3.4% is the maximum allowable under the tax cap law.  The High School, Park District and Village government all had levy increases of 3% or less, and the Library’s levy fell by 8.5%.  The Township anticipated that its increase would be capped at 3.4%, but an unexpected interpretation of the tax cap law generated $73,000 in additional revenue, resulting in a 4.8% tax increase.  The Township will make up for this year’s excess by seeking $73,000 less than the tax cap allows next year.

Can I do anything to reduce my current tax bill?   If you are eligible for a homeowner, senior citizen or disability exemption but did not receive one, the Township Assessor’s office can assist you in obtaining a revised bill for a smaller amount.  If you have received all exemptions for which you are eligible, however, you likely will not be able to do anything about your current bill.

Can I do anything to reduce future tax bills?  Oak Park taxpayers will soon have an opportunity to file appeals with the Cook County Board of Review, which will impact next year’s taxes if the appeals are successful.  When appeal dates are announced, residents may call Oak Park Township for help preparing appeals. 

Release date: September 20, 2021 

Ali ElSaffar
Oak Park Township Assessor
Oak Park Township
105 South Oak Park Avenue
Oak Park, Illinois 60302
Phone: 708-383-8005

Assessor News

View, print, and download the latest information from the Oak Park Township Assessor's Office.

Property Tax

Every Oak Park property pays a small share of Oak Park’s $199 million tax burden.

A property’s share of the burden is determined by comparing its assessed value to Oak Park’s overall assessed value.

Thus, a property that comprises 1% of the total assessed value of Oak Park pays 1% of Oak Park’s total tax burden.

Spending increases will raise the community’s overall tax burden, and changes in your property’s share of the burden will determine whether it pays a larger or smaller portion of the increased community-wide tax burden.

Property Tax Appeals


Contact:  Ali ElSaffar
Oak Park Township Assessor
(708) 383-8005

Taxpayers requesting assistance with their appeals may call 708-383-8005 to request a phone appointment.  

Effective:  July 30, 2020

Property Tax Exemptions

Senior Property Tax Exemptions

Applications for Senior Property Tax Exemptions have been mailed.  

A new law in 2019 provides automatic renewal for the Senior Exemption; it is available to all homeowners 65 years of age or older, regardless of income.

Disabled Veterans Property Tax Exemptions

All veterans who receive the Disabled Veterans Exemption are entitled to property tax savings.

A new law in 2016 allows veterans of the US Armed Forces who were severely wounded and while serving their country and who are at least 70% disabled complete exemption from property taxes

Frequently Asked Questions

In 2017, the state legislature approved a new program that provides state aid to school districts with very high property tax rates.  This year, twenty-eight Illinois school districts, including Oak Park and River Forest High School, qualified for financial aid under the new program.  The program provided the high school an extra $3.8 million in state aid this year, but in exchange, the school had to reduce its property tax levy.  This year’s levy is $4.5 million less than the levy from last year.

Ordinarily, the high school and most other taxing districts have the right to increase their tax levies by an amount equaling the annual rate of inflation.  If the school had not received the extra money from the state, it would have sought an inflation-level tax increase this year, and the result would have been a 4.4% tax increase for most property owners in Oak Park.  Thanks to the extra state money, however, the typical tax increase in Oak Park is just 2.1%. 

Local taxpayers should enjoy the tax relief provided by the new state program, but understand that it may not last.  The high school should remain eligible for this increased aid from the state for a number of years, but the additional money is not guaranteed, as the state could fail to fund the program or alter the eligibility rules.  In addition, program rules require the school district to reduce its tax levies in the initial year of the program, but apparently, do not require tax reductions in subsequent years.  Thus the duration of this year’s tax relief depends on decisions of the state legislature and the high school board. 

The reduction in the high school’s levy was offset by tax increases from local governments that did not receive new state aid targeted at reducing property taxes.  These increases, however, were generally moderate.  For example, the Township, the Park District, and Oak Park’s Village government each posted tax increases of about 3%.

The biggest local tax increase this year came from elementary school district 97.  The primary reason for its 4.1% increase relates to the continuing impact of an error made two years ago, when the school district received $2.6 million more from a referendum than it expected.  To make up for overtaxing two years ago, the school reduced its tax levies last year.  With a 4.1% tax increase this year, District 97’s overall levy is now close to the level it would have reached if the district had collected the correct amount of money in 2017, and then received inflation-level tax increases in the next two years.

If you are eligible for a homeowner, senior citizen or other exemption but did not receive one, the Township Assessor’s office can assist you in obtaining a revised bill for a smaller amount.  If you have received all exemptions for which you are eligible, you likely will not be able to do anything about your current bill.

Between July 1 and July 30, the Cook County Board of Review will be accepting appeals from Oak Park residents for next year’s taxes.  Residents may call the Oak Park Township Assessor’s office during the appeal period to schedule an appointment for help in preparing an appeal.  Alternatively, residents can get help at the end of the appeal period by attending a tax appeal seminar sponsored by the Board of Review.  The seminar will take place on July 30 at 6:30 PM at the auditorium of Percy Julian Middle School, located at 416 S. Ridgeland Avenue in Oak Park. 

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