All residential buildings or structures used as such which are unsafe, unsanitary, unfit for human habitation, or not provided with adequate egress, or which constitute a fire hazard, or which are otherwise to human life, or which in relation to existing use constitute a hazard to safety or health by reason of inadequate maintenance, dilapidation, obsolescence or abandonment, are hereby considered unsafe buildings. All such unsafe buildings are hereby declared illegal and a common and public nuisance and may be abated by repair and rehabilitation or by demolition in accordance with the following procedure:
A. 
Whenever the Building Inspector determines that there are reasonable grounds to believe that there has been a violation of any provision of this chapter or of any rule or regulation adopted pursuant thereto, he shall give notice of such alleged violation to the person or persons responsible therefor, and such alleged violation shall constitute a common and public nuisance. Such notice shall:
(1) 
Be put in writing.
(2) 
Include a statement of the reasons why the notice is being issued.
(3) 
Allow not less than 30 days for the performance of any act which the notice requires.
(4) 
State that if such repairs, reconstruction, alterations, removal or demolition are not voluntarily completed within the stated time as set forth in the notice, the Building Inspector shall institute such legal proceedings charging the person or persons, firm, corporation or agent with the violation of the provisions of this chapter.
Service of the notice shall be as follows:
A. 
By delivery to the owner personally or by leaving the notice at the usual place of abode of the owner with a person of suitable age and discretion;
B. 
By depositing the notice in the United States Post Office addressed to the owner at his last known address with postage prepaid; or
C. 
By posting and keeping posted for 24 hours a copy of the notice in a conspicuous place on the premises to which the notice relates.