Expiration of permits. No permit for the erection,
razing, change, alteration or removal of buildings shall be valid
or effective after one year from the date of issuance thereof and
shall thereafter be void, unless the work authorized by such permit
shall have been substantially commenced within one year from the date
of issuance and proceeded with due diligence. If, however, the applicant
has been delayed in proceeding with the work for which the permit
was granted by reason of any reasonable cause not due to his/her own
negligence, the permit may be renewed without additional cost to the
applicant.