Final answer:
Changes in zoning would be considered an external obsolescence because it is an external factor that can devalue a property. This contrasts with planned obsolescence, where products are designed to fail to encourage frequent replacement.
Step-by-step explanation:
The concept being discussed here is related to external obsolescence, which is a form of devaluation of a property due to external factors. Among the options provided, changes in zoning most accurately represent an external obsolescence, as it is a regulatory change that can affect the value or use of the property and is beyond the property owner's control. On the other hand, normal wear and tear, poor architectural design, and termite and pest control represent forms of physical obsolescence and functional obsolescence, which are internal to the property. Planned obsolescence is a separate business practice where products are designed to have a limited lifespan to encourage consumers to replace them more frequently. This discussion emphasizes a consumer culture where repair and maintenance have become less economically viable compared to replacement due to planned obsolescence.