Iowa Code § 384.27: Sale of bonds.

1. A city may sell general obligation bonds at public or private sale in the manner prescribed by chapter 75.

2. General obligation funding or refunding bonds issued for the purposes specified in section 384.24, subsection 3, paragraph “f”, may be exchanged for the evidences of the legal indebtedness being funded or refunded, or such funding or refunding bonds may be sold in the manner prescribed by chapter 75 and the proceeds applied to the payment of such indebtedness. Funding or refunding bonds may bear interest at the same rate as, or at a higher or lower rate or rates of interest than the indebtedness being funded or refunded.