Okla. Stat. tit. 62 § 57.193
The Oklahoma Building Bonds Commission may issue bonds pursuant to the provisions of this section for the purpose of refunding any outstanding obligations issued by the Commission or the State of Oklahoma Building Bonds Commission. The bonds may either be sold or delivered in exchange for outstanding obligations. If sold, the proceeds may be either applied to the payment of the obligations being refunded or deposited in escrow for the retirement of the obligations. No outstanding obligations may be refunded which are not maturing, callable for redemption under their terms or voluntarily surrendered by their holders for cancellation, unless the Commission covenants that sufficient funds to meet all remaining interest and principal payments of the outstanding obligations when due will be placed in escrow for such payments in the State Treasury at the time of delivery of and payment for the new bonds issued under this section. All bonds authorized to be issued under this section shall be secured in the same manner as provided for the bonds being refunded, except where more than one issue is being refunded. The Commission may provide that the refunding bonds have the same priority of payment and be paid from the same revenues as enjoyed by the obligations being refunded thereby. The Commission may enter into contracts and engage in such other acts as the Commission deems necessary to effect the offer and sale of its refunding bonds.
Okla. Stat. tit. 62, § 57.193