Okla. Stat. tit. 69, § 69-1320: Manner of assessments

Assessments in conformity to the appraisement and apportionment

as corrected and confirmed by the governing body of the city or the

board of county commissioners shall be payable, in cash, in ten

equal installments, and shall bear interest at a rate not to exceed

seven percent (7%) per annum until paid, payable in each year at

such time as the several installments are made payable. The

governing body of the city or the board of county commissioners

shall by ordinance or resolution levy assessments in accordance with

the appraisement and apportionment, as so confirmed, against the

various tracts, pieces and parcels of land liable therefor,

exclusive of streets and alleys. The ordinance or resolution shall

provide that the owners of the property so assessed shall have the

privilege of paying the amounts of their respective assessments

without interest at any time within thirty (30) days from the date

of the first publication of the ordinance or resolution.