Ohio Rev. Code Ann. § 5709.41
(A) As used in this section:
(B) The legislative authority of a municipal corporation, by ordinance, may declare to be a public purpose any improvement to a parcel of real property if both of the following apply:
(C) Except as otherwise provided in division (C)(1), (2), or (3) of this section, not more than seventy-five per cent of an improvement thus declared to be a public purpose may be exempted from real property taxation. The ordinance shall specify the percentage of the improvement to be exempted from taxation. If a parcel is located in a new community district in which the new community authority imposes a community development charge on the basis of rentals received from leases of real property as described in division (L)(2) of section 349.01 of the Revised Code, the parcel may not be exempted from taxation under this section.