en en de en en en en en en en en en en en en en en en en en en en en en en en en en en en vi en en en en en en en en en en en en en it en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en en ru en en en de en en en en en en en en en ru en en en en en en en en en en en en en en en en en en en eu en en vo en en en en en en en en en en en hbs_lat en en hbs_lat en en en en en en
To better assist you, we encourage you to schedule an appointment at our downtown and branch offices from 8:30 am to 5:00 pm.  The safety of our staff and the public is our top priority. Visitors are required to wear a mask and practice physical distancing. Schedule an appointment here.
Your Assessment & Tax Bill
Property Tax Rate Simulator Tool
CCAO Datasets on Cook County Data Portal
All Forms & Tools
Divisions & Assessment by Legal
Flood and Disaster Areas
Model Home Forms and Information
Property Tax Rate Simulator
Real Property Income & Expense (RPIE)
Business with the CCAO
File a Complaint Form
Facebook Instagram Linked In Twitter You Tube Medium
Vacancy Requests in the Assessment Process
Cook County Assessor’s Office
The Assessor’s Office has a statutory duty to assess properties at market value (or “fair cash value,” to use the language of the Illinois Property Tax Code) so other governmental agencies can determine appropriate tax levies and rates.
Neighborhood groups, elected officials, chambers of commerce, and local residents often express concern that not all property owners are paying their fair share of property taxes. These concerns occasionally lead to questions about whether above-market rates of vacancy have been claimed, resulting in tax burden shifts that may not be appropriate. In addition, the Assessor’s Office’s vacancy policy has not been public in the past, leading to a misunderstanding as to how it is applied.
Vacancy refers to the portion of a property building (improvement) that is not subject to a lease or from which the owner/landlord is not receiving rental income. Land assessed value is not adjusted based on vacancy evidence.
Vacancy reduces the assessed value of a property, which generally reduces the property’s taxes. Some level of commercial property vacancy is normal and expected. But, if some properties are being granted an excessive percentage of vacancy and gaining property tax relief, other property owners could be paying more of the property tax burden than they should be.
To address these concerns, the following provides information on how residential and commercial property vacancy in the Cook County Assessor’s Office (CCAO) is handled for those seeking a revision in their assessed value due to vacancy and market considerations.
For purposes of vacancy, Residential Properties include Single-family homes, residential condominiums, and multi-family homes of 2 to 6 units. Apartments of more than 6 units are considered to be Commercial Properties (see following section)
Residential assessment reduction as a result of a property vacancy will be recognized only in the event of a casualty.
Examples of a casualty include fire, flood and other natural disaster events. No more than 24 months of full or partial vacancy reduction will be tied to an individual event. If a property was uninhabitable in whole or part, please provide a description of the circumstance that caused the condition and the actions being taken to remedy the situation.
Documentation required for residential property seeking an adjustment:
Vacancy/Occupancy Affidavit – a month by month summary of the vacant space in the subject building for the last twelve months;
Rent roll report that validates the vacancy claim where applicable, covering the twelve months at issue;
Proof of the property being marketed for rent or sale;
Utility bills, insurance claim document and other information validating the claim as required by the Assessor Appeal Rules;
Authority to Represent Form (if applicable);
Photographs attesting to vacancy or the uninhabitable condition of property that are either dated, or accompanied by an affidavit attesting to the date on which the photos were taken, and the condition of the property on such date and the period for which the vacancy is requested.
As set forth in the Assessor’s Appeal Rules, if documentation such as utility bills are not available for all months for the period in question, a taxpayer may submit an affidavit attesting to that fact while submitting all available documentation.
Commercial assessment reduction as a result of a property vacancy will be recognized in the event that a building is not serving its intended use due to conditions outside the control of the property owner. For example:
An occupant-ready building where the property owner has made good faith efforts to lease/rent the property but no lease has been signed.
Casualty such as fire, flood and other natural disaster events.
No more than 24 months of full or partial vacancy reduction will be tied to an individual event.
Completion of the Vacancy Request Form, along with providing the following:
Vacancy/Occupancy Affidavit – a month by month summary of the vacant space in the subject building for the last twelve months
Rent roll report that validates the vacancy claim – covering the last twelve months
Proof of the property being marketed for rent or sale?
Utility bills from the vacancy time period, insurance claim document and other information validating the claim as required by the Assessor Appeal Rules
Representatives Authority to Represent Form (if applicable, but not required)
Photographs attesting to vacancy or where applicable the uninhabitable condition of property, that are dated or are accompanied by an affidavit attesting to the date and the condition of the property on such date.
As set forth in the Assessor’s Appeal Rules, if documentation such as utility bills are not available for all months for the period in question, a taxpayer may submit an affidavit attesting to that fact while submitting all available documentation.
Commercial assessment reduction as a result of a casualty event will be recognized. Examples of a casualty include fire, flood and other natural disaster events. If a property was uninhabitable in whole or part in the last twelve months, please provide a description of the circumstance that caused the condition and the actions being taken to remedy the situation.  No more than 24 months of full or partial vacancy reduction will be tied to an individual event.
Please note: If the property is a newly constructed building within the last 12 months, please provide information on when the building was ready for occupancy, a copy of any municipal occupancy permit, complete the Vacancy/Occupancy Affidavit and provide information on any tenant incentives that are currently in place.
Please note that the Cook County Assessor’s Office income approach estimate of property value includes the use of a market vacancy factor.
Cook County Assessor’s Office Review Process:
Review the current estimate of the property’s market value and assessed value
For commercial property, check the income approach valuation that was used in the initial assessed value determination and gather the amount of vacancy used in that calculation
Determine if property has an assessment value that already represents an additional vacancy revision from a prior tax year.  If the current assessed value already accounts for vacancy, a decision will be made whether any further vacancy reduction is appropriate.
Review all information supplied
Determine if any additional vacancy reduction is appropriate in view of evidence, adjust the current year assessed value
Current assessed value of the building for a subject property is $1,000,000.
Total Rentable Area in Building                               100,000 s.f.
Weighted Percentage Vacancy                               50%
Assume the subject property experienced a 10% vacancy factor in the initial valuation. Vacancy adjustment factor will be one-half of the weighted vacancy or in our instance 50% times 50% equals 25%, less the vacancy used in the initial valuation 10%, meaning an additional 15% reduction in the subject building’s assessed value in this case. Here is another view of the calculation: Bldg. AV of $1,000,000 X (1-.15) = $850,000 revised assessed value for the subject building accounting for the additional vacancy reductions.
If the Assessor valuation utilized a sales comparison or cost approach valuation in determining the assessed value in question, the property assessed value will be reviewed for accuracy and a determination will be made if a vacancy reduction is appropriate.
This policy was published on May 19, 2020 and updated on May 29, 2021. You can download it as a PDF below.