If the cost of remedying a condition is not paid within 90 days after receipt of a statement therefor from the City Recorder, the costs shall be levied against the property upon which the hazard exists as a special assessment. The levying of the assessment shall not affect the liability of the person to whom the order is directed to fine and imprisonment as provided in this chapter. This special assessment shall be certified by the City Forester to the City Recorder, and shall thereupon become and be a lien upon the property, and shall be recorded in the city lien docket by the City Recorder.