425 ILCS 55/1
That all public buildings now in process of construction or hereafter to be built or constructed, which may or shall be used for churches, school houses, operas, theatres, lecture rooms, hotels, public meetings, town halls, or which may or shall be used for any purpose whereby a collection of people may be assembled together for religious worship, amusement or instruction, shall be so built and constructed that all doors leading from the main hall or place where said collection of people may be assembled, or from the principal room which may be used for any of the purposes aforesaid, shall be so swung upon their hinges and constructed that said doors shall open outward; and that all means of egress for the public from the main hall or principal room, and from the building, shall be by means of doors which shall open outwards from the main hall or building.
425 ILCS 55/1