Ohio Rev. Code § 717.051
Any multi-level off-street parking structure that is not tax exempt under section 717.05 of the Revised Code and is acquired in fee or by lease or constructed by a municipal corporation that qualifies as an impacted city, as defined in division (C) of section 1728.01 of the Revised Code, at the time of the initial application for exemption provided for in this section or so acquired or constructed by a county within the corporate boundaries of such an impacted city, is hereby declared to be a public purpose and may, at the option of the impacted city or the county, be made the subject of an application for exemption and shall be exempt from taxation for such period as the parking structure is owned or leased by such municipal corporation or county and is available to members of the general public on a daily or monthly or other subscription basis, provided such period of exemption shall not exceed twenty years from September 30, 1974, or the date acquisition or construction of such structure is completed, whichever shall occur later. Any such exemption shall be claimed and allowed in the same or similar manner as in the case of other real property exemptions. In the event that an exemption status changes during a tax year, the procedure for the apportionment of the taxes for said year shall be the same as in the case of other changes in the exemption status during the tax year.
R.C. §717.051