Upon receiving the approval of the State Fiscal Accountability Authority or Department of Administration, as appropriate, and upon review by the Joint Bond Review Committee, the trustees may from time to time borrow such sums as may be necessary to accomplish the purpose of this article and to evidence these borrowings by bonds issued pursuant to this article in such aggregate principal amount as they determine, except that notwithstanding any other provisions of this article, there may not be outstanding at any time bonds issued pursuant to this article in excess of twenty-five million dollars.