When should a review appraiser employ an extraordinary assumption in their report?

The correct answer pertains to the appropriate use of extraordinary assumptions by a review appraiser. Extraordinary assumptions are utilized when certain conditions or factors are assumed to be true for the purpose of the appraisal, but lack definitive evidence to support them.

In the context of the review process, employing an extraordinary assumption allows the review appraiser to accept certain components of the original appraisal while integrating additional data that may lead to a more accurate or comprehensive conclusion. This approach acknowledges that the original appraisal had valid points or data but recognizes that further information might improve the valuation.

Using extraordinary assumptions can be beneficial in cases where the review process is intended to enhance understanding or clarify the value when complete information isn't available or when there are reasonable grounds to question some of the original assumptions. This strategic approach demonstrates a nuanced understanding of valuative practices and acknowledges the interconnectedness of assumptions and conclusions in commercial appraisals.

Utilizing extraordinary assumptions merely to highlight flaws, as suggested by another option, does not meet the definition or intent behind using these assumptions, which should focus on supporting the review process rather than criticizing the original work.