If the violation has not been corrected as set forth in the notice of violation, or, in the event of an appeal, within 25 days of the original deadline if the Director upholds the notice of violation, then representatives of the City of Grand Island may enter upon the subject private property and are authorized to take any and all measures necessary to abate the violation and/or restore the property. It shall be unlawful for any person, owner, agent or person in possession of any premises to refuse to allow the City’s designees or agents to enter upon the premises for the purposes set forth above.