(A) The districting or zoning of any municipal corporation or part thereof may be based upon any combination of two or more of the purposes described in R.C. §§ 713.07 through 713.09, inclusive. In the determination and establishment of such districts buildings and other structures may be classified on the basis of the nature or character of trade, industry, profession, or other activity conducted or to be conducted therein, the number of persons, families, or other group units to reside in or use them, the public, quasi-public, or private nature of the use thereof, or upon any other basis relevant to the promotion of the public safety, health, morals, convenience, prosperity, or welfare.
(B) The legislative authority may amend or change the number, shape, area, or regulations of or within any district, but no such amendment or change shall become effective unless the ordinance proposing it is first submitted to the Planning Commission for approval, disapproval, or suggestions and the Commission is allowed a reasonable time, not less than 30 days, for consideration and report.
(R.C. § 713.10)