Except as otherwise provided for in this article, the lawful use of buildings or properties existing at the date of the adoption of this chapter may be continued. It is the intent of this article that all nonconforming uses or lots shall not be enlarged upon, expanded or extended except in conformance with this chapter. For purposes of this section, an enlargement, expansion or extension is defined as an increase in the footprint. The following provisions shall apply to all nonconformities.