A plan of development shall remain valid for a period of twenty-four (24) months following the date of its approval. If at the end of that time, construction shall not have begun, then said plan of development shall be considered as having lapsed and shall be of no effect unless resubmitted to the Planning Commission and Council for re-approval. All construction and development under any building permit shall be in accordance with the approved site plan. Any departure from such plan shall be cause for revocation of a building permit or an occupancy permit. Any changes in an approved plan shall be resubmitted for approval in accordance with this chapter. Construction will be deemed to have begun when all necessary excavation and piers or footings of one or more principal buildings included in the development plan shall have been completed. (Ord. 2001-11. Passed 6-13-01.)