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The comparative unit method is commonly used for estimating costs in mass appraisal because it simplifies the valuation process by focusing on cost estimates based on unit prices for various property characteristics. This method allows appraisers to derive the value of a property by using factors such as the size, quality, and type of improvements compared to similar properties. The comparative unit method streamlines appraisals by establishing a baseline cost per unit (like square footage) based on existing market data, making it easier to apply across many properties without the need for extensive individual assessments.

This method is particularly effective in mass appraisal situations where a large number of properties need to be evaluated, as it utilizes benchmark data and uniform treatments to ensure consistency and efficiency in the valuation process. By leveraging available data from comparable properties, assessors can quickly estimate costs and valuations that reflect current market trends and conditions, making it a valuable tool in mass appraisal scenarios.

Other methods, while useful in specific contexts, do not focus on the broad applicability and efficiency needed for mass appraisals.