The Chief of the Fire Department may recommend to Council modifications of the provisions of the Fire Prevention Code upon application in writing by any property owner or lessee, or the duly authorized agent of either, when there are practical difficulties in the way of carrying out the strict letter of the Code, provided, that the spirit of the Code shall be observed, public safety secured and substantial justice done. The particulars of such modifications when granted or allowed shall be contained in an amendment to this Code or resolution of Council.