The owner or manager of a structure, in which one or more dwelling units or rooming units are let or intended to be let, shall make application for a rental housing license prior to letting the unit, unless such unit is currently certified. An owner or manager of such structure shall not allow occupancy of such unit until the certification-inspection fee has been paid and a rental housing license has been issued. The code official or housing inspector may issue a temporary rental housing license not exceeding three months in duration in order to bring the unit into compliance with this chapter.