The Chief of the Fire Department may recommend to the City Council variances from the provisions of the International Fire 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 the variances when granted or allowed shall be contained in a resolution of the City Council.