In Cook County, property tax reassessment is the process of evaluating the value of a property for tax purposes. The purpose of a reassessment is to ensure that the property is being taxed fairly based on its current market value.

Cook County conducts a reassessment every three years for all property types, including residential, commercial, and industrial. During a reassessment, an assessor will evaluate the property's physical characteristics, such as its size, age, and condition, as well as its location and any improvements that have been made to the property.

Once the reassessment is complete, the assessed value of the property is used to calculate the property tax bill. In Cook County, the property tax rate is set by each taxing district, such as the school district, park district, and local government, and is based on the assessed value of the property.

It's worth noting that property tax reassessment can result in higher or lower property taxes for property owners. If the assessed value of the property has increased since the last reassessment, the property tax bill will likely increase. Conversely, if the assessed value of the property has decreased, the property tax bill will likely decrease.

If you are a property owner in Cook County and are concerned about a property tax reassessment, there are steps you can take to ensure that your property is being assessed fairly. You can review the assessed value of your property on the Cook County Assessor's website and compare it to the assessed values of similar properties in your area. You can also file an appeal if you believe that the assessed value of your property is too high.