Ohio Rev. Code § 2127.09: Venue.

An action by an executor, administrator, or guardian to obtain authority to sell real property shall be brought in the county in which the executor, administrator, or guardian was appointed or in which the real property subject to sale or any part of the property is situated. If the action is brought in a county other than that in which the real property or a part of the property is situated, a certified transcript of the record of all proceedings had in that county shall be filed with and recorded by the probate court of each county in which the real property or any part of the property is situated.