Whenever conditions inside or under occupied business buildings provide extensive harborage for rats (in the opinion of the health officer) said health officer is empowered after due notification in accordance with Section 5.16.030, to close such business buildings until such time as the conditions are abated by ratproofing and harborage removal including, if necessary, the installation of suitable concrete floors in basements or replacement of wooden first or ground floors with concrete or other major repairs necessary to facilitate rat eradication. (Ord. A-143 §7, 1949).