When any lot, building, or structure within the City, because of accumulation of refuse or debris, the uncontrolled growing of weeds, or age or dilapidation, or because of any other condition or happening, becomes in the opinion of the Council, a public hazard or nuisance which is dangerous to the health or safety of the inhabitants of the City or of those of them residing or habitually going near such lot, building, or structure, the Council may, after investigation, give notice to the owner of the land upon which such hazard or nuisance exists, or to the owner of the building or structure itself, specifying the nature of the nuisance and requiring such owner to alter, repair, tear down, or remove the nuisance promptly and within a time to be specified by the Council, which shall be commensurate with the nature of the nuisance. If at the expiration of the time limit in said notice, said owner has not complied with the requirements thereof, or in any case where the owner of the land or of the building or structure itself is not known, the Council may order such hazard or nuisance abated by the proper department or agency of the city which is qualified to do the work required, and the cost of such abatement, to be assessed against the lot, premises, or description of real property upon which such hazard or nuisance was located. Procedures to be followed to make this section fully effective shall be established by ordinance.