Section 3303.4 of the International Building Code shall be considered as amended to read as follows:
“3303.4 Lot regulation: Whenever a structure is demolished or removed, the premises shall be maintained free from all unsafe or hazardous conditions by the proper regulation of the lot, restoration of established grades and the erection of the necessary retaining walls and fences in accordance with the provisions of Article 30. All footings and foundations of the demolished or removed structure shall be removed from the site”.