functional obsolescence

is a loss in value that generally occurs as a result of the changes in the tastes and desires of the typical purchaser. Outmoded or outdated systems or fixtures are likely to be a source of functional obsolescence. Functional obsolescence can also result from inadequacies in a structure (poor floor plan) or component (tub with no shower) as well as over-improvements in a structure or component (often referred to as a super-adequacy).

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