Ill. Admin. Code tit. 14, § 485.60
a) A person subject to this Part shall post on his or her premises the signs described below in English and in every other language in which the person provides or offers to provide assistance in immigration matters. English and foreign language signs shall be posted on separate signs. These individual signs shall be posted in a location where they will be visible to customers. Each sign shall be at least 11 inches by 17 inches, and the print on each sign shall be at least 1-1/2 inches tall. Each sign shall contain the following words or their substantial equivalents: