All signs must be maintained in a condition or state of equivalent quality to which
was approved or required by the City. An on-premise sign advertising an activity,
business, service or product must be removed or the sign face replaced with a blank
face within 60 days of the activity, business, or service promoted by the sign being
discontinued on the premises where the sign is displayed; if the use is not reestablished
or a new use is not established within two years and a replacement sign face conforming
to this Chapter installed, then the entire sign structure and mounting hardware must
be removed.