Ohio Const. art. XVIII, § 11

Any municipality appropriating private property for a public improvement may provide money therefor in part by assessments upon benefited property not in excess of the special benefits conferred upon such property by the improvements. Said assessments, however, upon all the abutting, adjacent, and other property in the district benefited, shall in no case be levied for more than fifty per centum of the cost of such appropriation. Effective: January 1, 1913