Bonds authorized by applicable law may be issued in one or more series, bear such date or dates, become due at such time or times within 40 years, except as expressly limited by applicable law, provided that notwithstanding any such express limitation bonds issued by Lockport High School, Township High School District 113, South Suburban Community College District No. 510, Elgin Community College District No. 509, or Kishwaukee Community College District No. 523 for the purpose of purchasing, constructing, or improving real property or paying claims against any such district incurred for the purpose of purchasing, constructing, or improving real property may become due within 25 years, bear interest payable at such intervals and at such rate or rates as authorized under applicable law, which rates may be fixed or variable, be in such denominations, be in such form, either coupon, registered or book-entry, carry such conversion, registration, and exchange privileges, be subject to defeasance upon such terms, have such rank or priority, be executed in such manner, be payable in such medium of payment at such place or places within or without the State of Illinois, make provision for a corporate trustee within or without the State with respect to such bonds, prescribe the rights, powers and duties thereof to be exercised for the benefit of the governmental unit and the protection of the bondholders, provide for the holding in trust, investment and use of moneys, funds and accounts held under an ordinance, provide for assignment of and direct payment of the moneys to pay such bonds or to be deposited into such funds or accounts directly to such trustee, be subject to such terms of redemption with or without premium, and be sold in such manner at private or public sale and at such price, all as the governing body shall determine. Whenever such bonds are sold at price less than par, they shall be sold at such price and bear interest at such rate or rates such that either the true interest cost (yield) or the net interest rate, as may be selected by the governing body, received upon the sale of such bonds does not exceed the maximum rate otherwise authorized by applicable law. Except for an ordinance required to be published by applicable law in connection with a backdoor referendum, any bond ordinance adopted by a governing body under applicable law shall, in all instances, become effective immediately without publication or posting or any further act or requirement.