In a petition for a writ of administrative mandate under Code of Civil Procedure section 1094 challenging the City's determinations that the overgrown weeds and rubbish on his lots constitute a public nuisance that required abatement and, when he refused to abate the nuisance, that a lien be placed on his lots for the City's abatement costs, the trial court's denial of the petition is affirmed where the City acted lawfully.