20 ILCS 1810/1

Such conveyance may be accepted subject to any one or all of the following conditions: (a) that title to such property will revert to the United States if and when the property is no longer used for the training of the National Guard or other military purposes, unless other use by this State is authorized by the federal government; (b) that buildings or other improvements on the property at the time of conveyance will not be disposed of without approval of the federal government; (c) that the United States may, in the event of a declared war, use such property without charge for the duration of such war and six months thereafter, except that the United States shall, during the period of such use, maintain the property and pay a fair rental for the use of structures or other improvements which have been added thereto without federal aid.