Which of the following is not a component of non-realty components in property appraisal?

The choice regarding land under a residential building is indeed the correct answer because land is classified as real property, forming a crucial component of real estate appraisal. Non-realty components typically refer to items associated with a property that are not considered part of the real estate itself.

In real estate appraisal, non-realty components can include equipment in a commercial property, which can affect the income and operational capacity of the business; furniture included in a sale, which can enhance the value of the property during a transaction; and personal property that is not comparable, as it relates to items that might not significantly impact the overall value of the real estate. These elements are considered separately from the actual real estate itself, which focuses on the physical land and any buildings or structures affixed to it.

Thus, the distinction lies in recognizing that land is integral to real property, while the other options refer to movable items or tangible assets that do not change the classification of the underlying real estate.