Whenever in the opinion of the city inspector with the concurrence of the county board of health any building or dwelling has, because of its unsanitary condition, become a menace to life or health, or unfit for human habitation, the city inspector with the consent of the county health board shall have the power to close to occupancy the building or dwelling and/or cause to be vacated the building or dwelling until the same is put in a clean and sanitary condition as required by the rules and regulations of the county board of health. It shall further be the duty of the county board of health to notify the owner, agent or lessee in writing of the action and to adequately post a notice of closure on the building or structure. (1986 Code)