40 ILCS 5/7-201
The assets of the fund in excess of the amount of cash required for current operation as determined by the board shall be invested, subject to the requirements and restrictions set forth in Sections 1-109, 1-109.1, 1-109.2, 1-110, 1-111, 1-114 and 1-115 of this Code.
No bank or savings and loan association shall receive investment funds as permitted by this Section, unless it has complied with the requirements established pursuant to Section 6 of "An Act relating to certain investments of public funds by public agencies", approved July 23, 1943, as now or hereafter amended. The limitations set forth in such Section 6 shall be applicable only at the time of investment and shall not require the liquidation of any investment at any time.
The board may sell any security belonging to the fund at any time in its judgment that it is necessary or desirable to do so.
The board shall have the authority to enter into such agreements and to execute such documents as it determines to be necessary to complete any investment transaction.
All investments shall be clearly held and accounted for to indicate ownership by the board. The board may direct the registration of securities or the holding of interests in real property in its own name or in the name of a nominee created for the express purpose of registration of securities or the holding of interests in real property by a savings and loan association or national or State bank or trust company authorized to conduct a trust business in the State of Illinois. The board may hold title to interests in real property in the name of the Fund or in the name of a title holding corporation created for the express purpose of holding title to interests in real property.
Investments shall be carried at cost or at a book value in accordance with generally accepted accounting principles and accounting procedures approved by the board.
The book value of investments held by any pension fund or retirement system in one or more commingled investment accounts shall be the cost of its units of participation in such commingled account or accounts as recorded on the books of the board.
40 ILCS 5/7-201