Ohio Rev. Code § 755.33: Awarding contracts.

The board of park trustees shall enter into the contract mentioned in section 755.29 of the Revised Code with the lowest responsible bidder. The board shall be the final judge as to who are the responsible bidders. Where the contract is for other than the construction, demolition, alteration, repair, or reconstruction of an improvement, the board shall enter into the contract when the bidder gives bond to the municipal corporation, with sureties approved by the board, that he will perform the work or furnish the material and supplies in accordance with his contract. On the failure of such bidder, within a reasonable time, to be fixed by the board, to so enter into bond with surety, the contract may be made with the next lowest responsible bidder, and so on until the contract is effected by the contractor giving bond. The board may reject any bid, and no member of the board shall be in any manner, either directly or indirectly, interested in any contract.