(1) The chief of police may designate an area of the city as a prostitution-free zone if the chief determines that, during the previous six months, the number of offenses listed in section 4.745 of this code is 50% higher than that for other similarly sized geographic areas of the city that are not located within a prostitution-free zone.

(2) The chief of police shall designate an area as a prostitution-free zone by following the rulemaking procedures described in section 2.019 of this code.

(3) The designation of an area as a prostitution-free zone shall expire after two years unless the chief of police renews the designation pursuant to the procedures described in subsection (2) of this section.