(a) The Governor may impose and collect reasonable fees for the use of the facilities and grounds of the Illinois Executive Mansion in Springfield and the Hayes Home on the DuQuoin State Fairgrounds. All such fees shall be deposited into the Illinois Executive Mansion Trust Fund.
     (b) The Illinois Executive Mansion Trust Fund is created as a separate trust fund outside the State treasury whose funds are not subject to appropriation by the General Assembly, for the purposes of improving, restoring, maintaining, furnishing and operating the Illinois Executive Mansion and the Hayes Home, and for the furnishing of the official offices of the Governor located in the State Capitol in Springfield and the James R. Thompson Center in Chicago. The State Treasurer shall be custodian of the fund, ex officio, and shall invest moneys in the fund in the same manner and subject to the same restrictions as moneys in the State treasury and shall pay out the moneys in the fund as directed by the Governor for the purposes specified in this Section and for no other purpose.