Iowa Code § 28F.8
Revenue bonds issued pursuant to this chapter shall bear interest at rates not exceeding those permitted by chapter 74A for revenue bonds issued by a city, may be in one or more series, may bear dates, may mature at times not exceeding forty years from their respective dates, may be payable in a medium of payment, at places within the state, may carry registration privileges, may be subject to terms of prior redemption, with or without premium, may be executed in the manner, may contain terms, covenants and conditions, may be sold at public or private sale in the manner and on terms provided by the entity or may be exchanged for outstanding interim notes, and may be in a form otherwise, as the resolution or subsequent resolutions provide.
Iowa Code § 28F.8