Applicability. No structure (except signs exempt from the provisions of this chapter) and no building shall be erected, constructed, reconstructed, moved, enlarged, or otherwise modified, or exterior architectural feature altered in the Commercial District or Business Park District until a certificate of appropriateness has been obtained from the Village Board. A certificate of appropriateness shall not be required for interior alterations or design features not subject to any public view, or for ordinary repairs and maintenance to the exterior of any structure or building where the purpose of such work is to correct any decay or damage and to restore, as nearly as practicable, its prior condition.