Whenever any sidewalk or curb has deteriorated to such an extent as to render the same unserviceable or unsafe, the city engineer shall give notice of such condition by personally serving a printed or written notice upon the owner or owners thereof – or if such personal service cannot be made on the owner or owners, similar service shall be made upon the person or persons living in or upon such premises – or if such premises be vacant, then upon the person or persons having charge and custody of such premises – or if service of notice cannot be made upon any of the persons named in the manner above provided, then by posting the notice in a conspicuous place upon the premises – and in all such cases where notice is not made personally upon at least one of the owners, a copy of the notice shall be mailed to the owner or owners of record at their address as shown by county tax records. Such notice shall demand that such defective sidewalk or curb or both shall be repaired or rebuilt as shall be required to make the same both serviceable and safe within the time stated, which time shall not be less than twenty four hours nor more than thirty days – or if the same is not so done within the time set forth in the notice, the city shall proceed to repair or rebuild such sidewalk or curb or both, and assess the cost thereof to the property – and the same shall be a lien upon such premises under the authority and in the manner contained in this chapter. Any such sidewalk or curb or both shall, when so repaired and rebuilt, conform to any rules, regulations or requirements for the same then in force within the city.