The approval of a variance and the stipulations, limitations and conditions therein shall be applied to the property in question. All written and graphic materials officially submitted to the City shall be treated as a formal agreement between the applicant and the City. Once approved, no changes, modifications or alterations shall be made to any plan detail, standard, or specifications without prior submission of a plan modification request to the Zoning Administrator for review and approval. (Prior Code § 20-6-5)