Ohio Revised Code Title VII. Municipal Corporations § 735.05

The director of public service may make any contract, purchase supplies or material, or provide labor for any work under the supervision of the department of public service involving not more than fifty thousand dollars. When an expenditure within the department, other than the compensation of persons employed in the department, exceeds fifty thousand dollars, the expenditure shall first be authorized and directed by ordinance of the city legislative authority. When so authorized and directed, except where the contract is for equipment, services, materials, or supplies to be purchased under division (D) of section 713.23 or section 125.04 or 5513.01 of the Revised Code or available from a qualified nonprofit agency pursuant to sections 4115.31 to 4115.35 of the Revised Code, the director shall make a written contract with the lowest and best bidder after advertisement for not less than two nor more than four consecutive weeks in a newspaper of general circulation within the city or as provided in section 7.16 of the Revised Code.