At the time fixed in said notice the City Council of the City of Sebastopol shall proceed to hear the testimony of the Building Official, the owner or his representative, 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 removal, repair or reconstruction and any other matters which said Council may deem pertinent thereto. Upon the completion of said hearing the City Council 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 passage of said resolution by having said building properly constructed or repaired, or by having the same razed or removed, and notifying said owner that if said nuisance is not abated, said building to be razed or removed by the City of Sebastopol and the expenses thereof made a lien on the lot or parcel of land upon which the building is located. The City Council of the City of Sebastopol may grant any extensions of time to abate said nuisance that it may deem justifiable upon good cause therefor being shown. A copy of the resolution declaring the nuisance shall be served upon said owner in the manner provided in this chapter for the service of notices.