Refunding bonds may be sold or exchanged in installments at different times, or an entire issue or series may be sold or exchanged at one time. Any issue or series of refunding bonds may be exchanged in part or sold in part in installments at different times or at one time, and such bonds may be sold or exchanged at any time on, before, or after the maturity of any of the outstanding notes, bonds, certificates, or other obligations to be refinanced thereby. If the governing body shall determine to:

1.    Exchange any refunding bonds, such bonds may be exchanged privately for, and in payment and discharge of, any of the outstanding notes, bonds, or other obligations of the municipality issued to finance or to aid in financing the acquisition, construction, improvement, or refinancing of an enterprise. The refunding bonds may be exchanged for a like or a greater principal amount of such notes, bonds, or other obligations of the municipality. The principal amount of the refunding bonds, however, may exceed the principal amount of outstanding notes, bonds, or other obligations for which they are exchanged only to the extent necessary or advisable, in the discretion of the governing body, to fund interest in arrears or about to become due. The holder or holders of such outstanding notes, bonds, or other obligations need not pay accrued interest on the refunding bonds to be delivered in exchange therefor if, and to the same extent that, interest is due or accrued and unpaid on such outstanding notes, bonds, or other obligations to be surrendered.

2.    Sell any refunding bonds, such bonds shall be sold at not less than ninety-eight percent of par at public or private sale in such manner and upon such terms as the governing body shall deem for the best interests of the municipality.

3.    Exchange or sell any refunding bonds more than six months in advance of the date on which the bonds being refunded mature or are redeemable in accordance with their terms to reduce the debt service costs, extend or adjust maturities in relation to the revenues pledged for payment of the bonds, permit the more advantageous sale of     additional bonds, or any other purpose deemed necessary or desirable by the governing body, then the proceeds of the refunding bonds, including any premium and accrued interest, shall be deposited in escrow with a suitable bank or trust company, having its principal place of business within or without the state, and shall be invested in such amount and in securities maturing on such dates and bearing interest at such rates as shall be required to provide funds sufficient to pay when due the interest to accrue on each bond refunded to its maturity or, if it is prepayable and called for redemption, to an earlier prior date upon which it may be called for redemption, and to pay and redeem the principal amount of each such bond at maturity or, if prepayable and called for redemption, at the earlier redemption date, and any premium required for redemption on such date, or in the case of a crossover refunding, must be invested in securities irrevocably appropriated to the payment of principal and interest on the refunding bonds until the date the proceeds are applied to the payment or redemption of the bonds to be refunded. The governing body’s resolution authorizing the refunding bonds shall irrevocably appropriate for these purposes the escrow fund and all investments thereof, which shall be held in safekeeping by the escrow agent, and all income therefrom, and may provide for the call for redemption of all prepayable bonds in accordance with their terms. The securities to be purchased with the escrow fund shall be limited to general obligations of the United States, securities whose principal and interest payments are guaranteed by the United States, and securities issued by the following United States government agencies: banks for cooperatives, federal home loan banks, federal intermediate credit banks, federal land banks, and the federal national mortgage association. Such securities shall be purchased simultaneously with the delivery of the refunding bonds. Moneys on hand in the sinking fund maintained for the payment of the outstanding bonds, and not immediately needed for the payment of interest or principal due, or other legally available funds of the municipality may likewise be deposited in the escrow fund and invested in the same manner as the proceeds of the new bonds, to the extent consistent with the provisions of resolutions authorizing the outstanding bonds.