1. Introduction Commercial property owners often focus on property taxes when the bill arrives. That is understandable, but it may be too late. In Cook County, the appeal process is tied to assessment notices, township filing windows, and Board of Review deadlines, not just the final tax bill. 2. The Tax Bill Is Not the Starting Point The bill tells you what you owe. The assessment process helps determine how the taxable value was set. If the assessment is too high, the owner needs to act during the appropriate appeal window. 3. Commercial Appeals Require More Than Complaining About Taxes For commercial and income-producing properties, the appeal may involve real…