Property Valuation

In Illinois, mass appraisal (used by county assessors) differs from individual property appraisal in that:

AMass appraisal values each property individually using only the income approach
BMass appraisal values large numbers of properties simultaneously using statistical models and market data rather than individual property inspections✓ Correct
CMass appraisal is only used for commercial properties
DMass appraisal produces legally defensible values while individual appraisals do not

Explanation

Mass appraisal (used by county assessors for property tax assessment) involves valuing large numbers of properties at a point in time using statistical analysis, comparable sales data, and property characteristic databases—rather than individual property-by-property inspections. Illinois county assessors conduct mass appraisals to set assessed values for all properties. Individual appraisals (for lending, estate, or legal purposes) involve detailed inspection and analysis of a single property.

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