Ohio Rev. Code § 307.06: Board of county commissioners may employ land appraisers.

Whenever it is necessary for the board of county commissioners to determine the value of any real property owned by the county, or which it proposes to acquire by purchase, lease, or appropriation, the board may employ competent appraisers to advise it of the value of such property, or expert witnesses to testify thereto it an appropriation proceeding, and shall pay a reasonable compensation for such services.