Ohio Rev. Code § 5709.431
The amendment by H.B. 110 of the 134th General Assembly of section 5709.40 of the Revised Code applies to any projects commenced or completed, or ordinances adopted, on, before, or after September 30, 2021, provided that, with respect to projects commenced or completed, or ordinances adopted, before September 30, 2021, the legislative authority of the municipal corporation adopts an ordinance after September 30, 2021, to confirm the applicability of the amendment to the project or ordinance.The amendment by that act of section 5709.41 of the Revised Code applies to ordinances adopted after September 30, 2021, and also to ordinances adopted on or before that date if, and to the extent that, the ordinance either specifies the tax year in which the exemption commences, provides that the exemption commences in the tax year in which the value of an improvement exceeds a specified amount or in which the construction of one or more improvements is completed, or allows for the exemption to commence in different tax years on a parcel-by-parcel basis.
R.C. § 5709.431