It shall be unlawful for any person or entity to erect a structure or make any external alterations or external repairs of any substantial* nature (to include such as color changes and sign erection) in any manner whatsoever, to any area, district, site, building or structure within the confines of a designated zoned historical site or district without first obtaining a permit as provided herein.
*(Substantial means that which would alter the architectural appearance and basic architectural design of any building, structure, site, area, or district within the Historical District.)