The Cook County Board of Review (CCBOR) has received a record number of property tax appeals, involving a nearly 41 percent increase in the total of Property Index Numbers (PINs) compared to the 2023 tax year. Appeals filed for tax year 2024 increased by 11 percent over tax year 2023 and also by more than 10 percent above 2021, which was the last time the city was reassessed. The unprecedented volume of 273,907 property tax appeals filed with CCBOR for tax year 2024 has presented the biggest challenge in the agency’s history—a challenge it continues to meet, as more than half the appeals have already been finalized. This surge of homeowners, businesses, and landowners seeking fairness and accuracy is largely due to significant increases in property values across commercial and residential sectors in Cook County. According to the Cook County Assessor’s Office Final Chicago Reassessment Data for 2024, the total assessed property value in Cook County has increased by 23%, or $9.5 billion, growing from $41.3 billion to $50.8 billion. A major reason for this jump has been an increase in commercial property assessments. Homeowners, especially in the south suburban neighborhoods and parts of Chicago, have seen their properties impacted by sharp increases in assessed value, thus resulting in higher tax bills In addition, commercial properties, particularly in revitalized neighborhoods and near new infrastructure developments, have experienced the largest increases. For more information on how to appeal a property tax assessment, homeowners and business owners can visit the Board of Review website: www.cookcountyboardofreview.com.