Ohio Rev. Code § 1335.04: Interest in land to be granted in writing.

No lease, estate, or interest, either of freehold or term of years, or any uncertain interest of, in, or out of lands, tenements, or hereditaments, shall be assigned or granted except by deed, or note in writing, signed by the party assigning or granting it, or his agent thereunto lawfully authorized, by writing, or by act and operation of law.