In the case provided for in Section 3.28.515, at the time of making the assessment, when in the opinion of the assessor said taxes are not a lien on real property or that the real property is insufficient to secure the payment of the taxes, and upon notice thereof given to the tax collector by the assessor, the tax collector may collect the taxes by seizure and sale of any personal property owned by the person against whom the tax is assessed, or if no personal property can be found, then the tax collector can sue in the name of the city for the recovery of the taxes as provided in Section 3.28.570. (Prior code § 6.04.1050)