Section 75 ILCS 16/30-55.20 - Purchase or lease of property; construction of buildings(a) The board may purchase or lease real or personal property and may construct an appropriate building or buildings for the use of the library or libraries established under this Act, using, at the board's option, contracts providing for all or part of the consideration to be paid through installments at stated intervals during a certain period not to exceed 20 years, with interest on the unpaid balance at any lawful rate for municipal corporations in this State.(b) The board may refund at any time any installment contract entered into under this Section by means of a refunding loan agreement. The refunding loan agreement may provide for installment payments of principal and interest to be made at stated intervals during a certain period not to exceed 20 years from the date of the refunding loan agreement, with interest on the unpaid principal balance at any lawful rate for municipal corporations in this State. No installment contract or refunding loan agreement for the same property or construction project may exceed an aggregate of 20 years.