The school board or board of education of any public school district may enter into a lease or lease-purchase agreement for the exclusive use of its individual jurisdiction for such buildings or equipment as the board determines necessary. Such lease or lease-purchase agreements may not exceed a period of seven years, except that lease-purchase agreements entered into as part of an energy financing contract pursuant to section 66-1065 may not exceed a period of thirty years. All payments pursuant to such leases shall be made from current building funds or general funds. No school district shall directly or indirectly issue bonds to fund any such lease-purchase plan for a capital construction project exceeding twenty-five thousand dollars in costs unless it first obtains a favorable vote of the legal voters pursuant to Chapter 10, article 7. This section does not prevent the school board or board of education of any public school district from refinancing a lease or lease-purchase agreement without a vote of the legal voters for the purpose of lowering finance costs regardless of whether such agreement was entered into prior to July 9, 1988.