775 ILCS 5/3-104.1

Refusal to sell or rent because a person has a guide, hearing or support dog. It is a civil rights violation for the owner or agent of any housing accommodation to:

(A) refuse to sell or rent after the making of a bona fide offer, or to refuse to negotiate for the sale or rental of, or otherwise make unavailable or deny property to any blind or hearing impaired person or person with a physical disability because the blind or hearing impaired person or person with a physical disability has a guide, hearing, or support dog; or

(B) discriminate against any blind or hearing impaired person or person with a physical disability in the terms, conditions, or privileges of sale or rental property, or in the provision of services or facilities in connection therewith, because the blind or hearing impaired person or person with a physical disability has a guide, hearing, or support dog; or

(C) require, because a blind or hearing impaired person or person with a physical disability has a guide, hearing, or support dog, an extra charge in a lease, rental agreement, or contract of purchase or sale, other than for actual damage done to the premises by the dog.