Loss of value due to a property's features or appearance going out of style or being replaced by a more appealing, effective version is called:

Functional obsolescence

Explanation:

In simple words, Functional obsolescence can be understood as the drop in the functionality or attractiveness of an entity owing to an obsolete design component which can not be quickly adjusted. Depending on sector, the use of the word varies.

The measure is the discrepancy among the replacement expense within and against the treatable object as of the point of measurement with respect to a practical obsolescence loss that prevents anything.

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