Revocation. As noted in § 270-129 of this article, conditional use permits are to be revoked in instances when building construction has not started with one year of approval of the conditional use permit or, in cases of tenancy changes, if the new tenant has not occupied the building within one year of approval. In the event that site work has commenced (i.e., tree removal, grading, utility installations, etc.) within one year, but building construction has not yet commenced, the PZC may waive the revocation. In the case of tenancy changes, if internal or external building modifications have commenced within one year, but the new tenant has not occupied the building, the PZC may waive the revocation.