“Alteration” means a change in the character, composition, or structure of a potential historical resource or historical resource which is not classified as work exempt from building permits (Building Permit Form 4551) or those activities that are exempt pursuant to CVMC 21.03.054. (Also see the City’s HPP Section 4.0, Historic Preservation Projects, and Appendix – Preservation Brief 14: New Exterior Additions to Historic Buildings.) (Ord. 3196 § 3, 2011).