Ohio Rev. Code Ann. § 4781.52

No municipal corporation may adopt or continue in existence any ordinance and no township may adopt or continue in existence any resolution that is in conflict with sections 4781.36 to 4781.52 of the Revised Code, or that regulates those rights and obligations of parties to a rental agreement that are regulated by sections 4781.36 to 4781.52 of the Revised Code. Sections 4781.36 to 4781.52 of the Revised Code do not preempt any housing, building, health, or safety codes of any municipal corporation or township.