An approved Development Plan shall remain valid for a period of twelve (12) months following the date of its approval, unless the Planning Commission authorizes a longer period at the time of approval. If, at the end of that time, a Zoning Permit has not been obtained and/or the construction of the development has not begun, then approval of such Development Plan shall expire and shall be of no effect unless resubmitted and re-approved in accordance with the procedures set forth in this Chapter. Construction is deemed to have begun when all necessary excavation and piers or footings of one or more principal buildings included in the plan have been completed. (Ord. 19-10. Passed 11-7-19.)