The formation of a parking district may be proposed by petition signed by the owners of real property in the proposed district, as shown by the last equalized assessment roll, owning real property of an assessed value of not less than fifty-one percent (51%) of the total assessed value of all taxable real property in the district, as shown by the assessment roll, and owning taxable land in the proposed district constituting not less than fifty-one percent (51%) of the total area of all taxable land in the district.