Whenever conditions inside or under unoccupied business buildings provide extensive harborage for rats, in the opinion of the Health Officer, the Health Officer is empowered to require compliance with the provisions of Section 1109.03 and in the event that such conditions are not corrected within a period of sixty days, or within the time to which a written extension may have been granted by the Health Officer, the Health Officer is empowered to institute condemnation and destruction proceedings. (1967 Code Sec. 16-12)