Ohio Rev. Code § 749.10: Terms of contracts.

All contracts for the erection of a hospital building shall be made in the name of the municipal corporation or the board of hospital commissioners, and it shall be stipulated therein that the contractor will not execute any extra work, or make any modifications or alterations mentioned in the specifications and plans, unless ordered in writing by the board of hospital commissioners, that the contractor will not claim any pay therefor unless such written order is given, and the additional compensation fixed and agreed upon. Copies of the plans and drawings, attested by the contractor, and the original bids, specifications, and contracts shall be deposited in the office of the clerk of the municipal corporation.