Condo and co-op associations can file a joint appeal covering multiple units, filed by an authorized representative and focused on valuation uniformity. Documents may include a unit list with PINs, board authorization, recent in-building sales, and assessment summaries. It must be filed during the township's open window.
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How do I file a joint appeal (for condos or co-ops) and what documents are needed?
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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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Source: Cook County Assessor and Board of Review public appeal records. Past results do not guarantee a similar outcome.
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