When Cook County reassesses a condominium building, individual unit owners often focus only on their own assessment notice. That is understandable. But it may be too narrow. For many condominium buildings, the better question is whether the condo board should review the assessments across the entire building and consider a group appeal. Why Condo Buildings Are Different Condominiums are often easier to compare than single-family homes because similar units may exist in the same building. A building may have several units with the same floor plan, same square footage, same number of bedrooms and bathrooms, same tier, similar views, and similar amenities. That creates a useful opportunity. If similar units…