The rules and regulations adopted by the Commission under <cite data-path="|6">this article</cite>:must include design guidelines for undertaking regulated alterations; and may include provisions delegating to the Executive Director or other Commission staff the authority to review and approve regulated alterations that involve only minor work, as defined in subsection (b) of this section. “Minor work” means work that:does not significantly change the overall appearance of or remove historic fabric; and clearly meets the applicable design guidelines adopted by the Commission under <cite data-path="|6">this article</cite>. Ord. 15-408