Okla. Stat. tit. 62 § 442
The board of county commissioners is hereby authorized to use for the purpose of erecting or rebuilding a county courthouse or a superior court building at such points in the county as the board may deem necessary and to furnish and equip such building, and for such purpose, said board is authorized to use any or all of the unassigned portions of the sinking fund of the county derived from penalties, interest or forfeitures accrued or to accrue and in addition thereto, is authorized to make and enter a levy of not to exceed one (1) mill of tax in any one (1) year and under the existing laws such tax shall be annually added to the funds herein provided for and which said levy may be equal to but not to exceed the constitutional limitation of eight (8) mills; provided further, that there is hereby authorized to be created by resolution a courthouse fund of any such county which shall be known and designated as a special courthouse fund and all monies as aforesaid shall be converted into and become a part of said special fund and shall be irrevocably pledged to the payment of the costs of the construction or rebuilding or repair of any such courthouse. Such board of county commissioners is further authorized to issue time warrants against said special fund which shall run serially and shall bear interest not to exceed six percent (6%), per annum, which interest shall be payable annually; when such warrants have been issued, then the levies so made and the accumulations of penalties, interests and forfeitures which constitute the fund from which such time warrants are payable; provided, that this act shall not affect or impair the provisions of Chapter 209, Session Laws of Oklahoma, 1919, being otherwise known as Chapter 80, Session Laws of Oklahoma, 1921.
Okla. Stat. tit. 62, § 442