Evanston, Ill., City Code § 5 § 5-3-4-2

(A) The housing provider, from time to time, may adopt general rules or regulations concerning the tenant's use and occupancy of the premises. They are enforceable only if in writing and:
1. Their purpose is to promote the convenience, safety and welfare of the tenants in the premises, preserve the housing provider's property from abusive use or make a fair distribution of services and facilities among tenants;
2. They are reasonably related to the purpose for which they are adopted;
3. They apply to all tenants in the premises in a fair manner;
4. They are sufficiently explicit to fairly inform the tenant of what he/she must or must not do to comply;
5. They are not for the purpose of evading the obligations of the housing provider;
6. They are not for the purpose of preventing tenants to assemble or otherwise communicate amongst each other about the premises;
7. The tenant has notice of them at the time the tenant enters into the rental agreement; and
8. They do not restrict the tenant from housing any specific breed of dog in or on the premises where housing a dog in or on the premises is otherwise allowed.
(B) A rule or regulation adopted after the tenant enters into the rental agreement that substantially modifies the tenant's bargain is not enforceable unless the tenant consents to it in writing.