(a) At the time fixed in said notice, the governing board of the enforcement agency shall proceed to hear the testimony of the officers or employees of the enforcement agency and the owner or his representatives, if present at said hearing, and other competent persons who may be present and desire to testify, respecting the condition of said building, the estimated cost of its reconstruction, repair or removal, and any other matter which said governing body may deem pertinent thereto. Upon the conclusion of said hearing, said governing board may, by resolution, declare its findings and, in the event that it so concludes, it may declare said building to be a nuisance and direct the owner to abate the same within 30 days after the date of posting on said premises a notice of the passage of said resolution by having said building properly reconstructed or repaired, or having the same razed or removed and notifying said owner that if said nuisance is not abated said building will be razed or removed by the enforcement agency and the expense thereof made a lien on the lot or parcel of land upon which said building is located.

(b) At any time within 60 days after the passage of any resolution directing the abatement of a nuisance, the enforcement agency shall post a copy thereof conspicuously on the building so declared to be a nuisance and mail another copy by registered mail, postage prepaid, return receipt requested, to the person owning the land on which the building is located as such person's name and address appear on the last equalized assessment roll or as known to the clerk of the governing board of such enforcement agency, and a copy of said notice shall be mailed to each mortgagee or beneficiary under any deed of trust, of record, at the last known address of such mortgagee or beneficiary, and if such address is unknown to the enforcement agency, then said fact shall be stated in said copy so mailed and it shall be addressed to him at the county seat of the county where said property is situated. The officer or employee of the enforcement agency, upon giving notice as aforesaid, shall file an affidavit thereof in the manner provided for in Section 58 thereof. The governing board of the enforcement agency may grant any extension of time to abate said nuisance that it may deem justifiable upon good cause therefore being shown.