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The Comparative Unit of Measure in estimating costs primarily involves using a ratio or comparison method that evaluates similar properties to estimate costs effectively. This approach allows appraisers and assessors to determine the value or cost of a property by comparing it to other properties that have similar characteristics, such as size, location, and type of construction.

Using the comparative method is beneficial because it relies on actual market data from similar properties, which provides a realistic basis for cost estimation. By analyzing comparable properties, stakeholders can derive unit costs that more accurately reflect the economic reality, making it easier to arrive at cost estimates that are justifiable and grounded in the current market.

In contrast, the other options do not capture the essence of the Comparative Unit of Measure. For instance, looking at the cheapest construction option does not consider the qualities or characteristics of similar properties, which is integral to the comparative approach. Focusing solely on new constructions within an area disregards existing properties and their values, which are critical for comparison. A detailed cost report for each project may provide exhaustive information but does not align with the method of using ratios or comparisons inherent in the definition of the Comparative Unit of Measure.