Ohio Rev. Code § 709.28
The commissioners appointed by the respective municipal corporations proposing annexation pursuant to sections 709.23 to 709.33, inclusive, of the Revised Code, shall proceed to arrange the conditions of annexation and report the result of their action to the legislative authorities of their respective municipal corporations within one hundred twenty days from the date of the appointment of the commissioners of the municipal corporation with which annexation is proposed.
If such commissioners are unable to agree upon the conditions of annexation within such time, the probate judge of the county in which the municipal corporations are situated shall appoint one additional commissioner, who shall not be a resident of either of such municipal corporations. The additional commissioner shall act with the other commissioners appointed as provided by such sections, in arranging conditions of such annexation, and the conclusions arrived at and agreed upon by any four of such commissioners shall be the conditions upon which said annexation shall be submitted to the voters of such municipal corporations, and the findings thus arrived at shall be reported by the commissioners to the legislative authority of each of such municipal corporations.
R.C. §709.28