Ohio Revised Code Title V. Townships § 519.19

The lawful use of any dwelling, building, or structure and of any land or premises, as existing and lawful at the time of enactment of a zoning resolution or amendment thereto, may be continued, although such use does not conform with such resolution or amendment, but if any such nonconforming use is voluntarily discontinued for two years or more, any future use of said land shall be in conformity with sections 519.02 to 519.25, inclusive, of the Revised Code.  The board of township trustees shall provide in any zoning resolution for the completion, restoration, reconstruction, extension, or substitution of nonconforming uses upon such reasonable terms as are set forth in the zoning resolution.