A building or use existing lawfully at the time of this Development Code, or an amendment thereto, became or becomes effective, but which does not comply with the off-street parking regulations for the use may continue without such parking facilities. In the event an existing building is altered or a use is changed or substituted, in accordance with the regulations in Chapter 1139, Non-conforming Uses, Lots, and Structures, then additional off-street parking spaces shall be provided in compliance with this Chapter 1187, if this Code requires such additional parking spaces as a result of the proposed changes.