If a nuisance is not corrected or a hearing sought within the time specified pursuant to Section 13.16.250, or if, after hearing, a nuisance is not abated pursuant to, and in the time required by, Section 13.16.290, the building official shall cause the nuisance to be abated and for that purpose he and others at his direction, may enter the property where the nuisance exists. (Prior code § 7789)