extraordinary assumption

refers to when an appraiser must presume as fact information that is otherwise uncertain in order to complete the appraisal. Every appraisal requires assumptions to be made.

An appraiser may not be able to make an interior inspection of the subject when the property is a foreclosure. It may be necessary for the appraiser to assume the quality and condition of the interior in order to proceed with the assignment. These assumptions about the interior would be classified as an extraordinary assumption. The use of extraordinary assumptions is covered in USPAP Standards Rule 1-2(f).

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