Mo. Rev. Stat. § 77.160

77.160. Payment for property acquired — issuance of bonds. — The mayor and council of said cities are authorized to accept gifts and grants and to borrow money and execute, issue and negotiate bonds or other securities, for the purpose of paying the cost of acquiring said property or the construction of said buildings or works thereon, and to secure same by mortgages or deeds of trust on said properties and the income and revenue derived therefrom; which said mortgage or deeds of trust shall be a first lien on all said property and all revenues or income therefrom and shall be enforceable as provided therein but shall not be a debt of said city or payable out of any revenue not derived from said property. Said bonds issued under the provisions of this section and sections 77.150 , 77.170 and 77.180 shall bear interest at a rate not exceeding six percent per annum, payable annually or semiannually, shall be executed in such manner and be payable serially in annual installments beginning not later than three years and extending not more than forty years from the date thereof, and at such place or places as the mayor and council shall determine. Any income, receipts, collections and profits from any properties on which such a mortgage or deed of trust has been so executed, shall be held and kept in the city treasury as a separate fund, and payments therefrom shall be made only as provided by said mortgage or deed of trust.

(RSMo 1939 § 7046) CROSS REFERENCE: Improvements, special tax bills and bonds issued in payment of, 88.497 to 88.647