Assessed value can rise due to higher market values, a countywide three-year reassessment, property improvements/renovations, corrected property records (e.g., updated square footage), or—for commercial—higher income or lower vacancy. A higher assessment doesn't always mean higher taxes, since rates and the state equalization factor also matter. You can appeal if you think it's too high.
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Why did my assessed value increase?
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In 2025 our clients were 1.7 times as likely to win a reduction at the Assessor, and 1.3 times as likely at the Board of Review, as clients of attorneys who filed 100+ residential appeals (2.2 times at the Assessor in 2026 so far).
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3-tier escalation: Assessor → BOR → PTAB
Source: Cook County Assessor and Board of Review public appeal records. Past results do not guarantee a similar outcome.
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