No sign may be altered, replaced, converted, changed or otherwise modified except
in accordance with the requirements of this UDO or an adopted Streetscape Plan or Custom Signage Plan. In the event there is an adopted Streetscape Plan or Custom Signage Plan that applies to the subject property and that regulates signage, conformance to the adopted plan is required. The standards of the Streetscape Plan or Custom Signage Plan shall apply in lieu of the standards of Article 7.3 as applicable.