All parking places acquired and constructed pursuant to this part are public parking places, but, if the ordinance, resolution, or indenture providing for the issuance of the bonds provides for the levy of an ad valorem assessment upon the taxable real property in the district, the commission may restrict or partially restrict their use to owners and tenants of real property in the district, and classes of persons designated by such owners or their tenants and may establish rates, charges, or rentals for the owners and tenants of such properties and classes of persons designated by the owners or tenants which differ from and are less than the rates, charges, or rentals charged other persons.