Ohio Rev. Code Ann. § 5715.25

If the tax commissioner increases or decreases the aggregate value of the real property or any class thereof on the tax list or agricultural land tax list in any taxing district or subdivision of the state under section 5715.24 of the Revised Code, he shall transmit to each county auditor a statement which specifies the amount or per cent to be added to or deducted from the valuation of such property or class thereof in each taxing district or subdivision in his county.