The lawful continuance of any activity in progress at the time of the enactment of this chapter may be continued even though it does not conform to the requirements of this chapter. For purpose of this section, an “activity in progress” is a building, construction, land use or other activity which has been finally permitted by all other governmental agencies having jurisdiction thereover, and which has been physically commenced. Ordinary repairs and maintenance of any existing building, structure or land shall be allowed. Any change, expansion, alteration or enlargement of such existing lawful use shall be subject to all requirements of this chapter. (Ord. 492, 2004)