“Certificate of appropriateness” means the action of the board after it has reviewed the proposed changes to the exterior of a register property, or a property within a historic district, or to the interior of a register property if interior features were a contributing factor in the property’s designation, and certified the changes as not adversely affecting the historic characteristics of the property which contribute to its designation. The exterior of a property may include any significant outside features that contributed to the property’s listing, such as, but not limited to, outbuildings, garden features, etc. (Ord. 2322 § 4, 2020; Ord. 2069 § 2 (Exh. B), 2011; Ord. 1635 § 1, 1996; Ord. 1258 § 1, 1987).