New year, new Illinois real estate laws. The one that affects the general public the most is the new carbon monoxide detector law. The new act, Public Act 94-741 (HB 5284) requires that every Illinois residence must have a carbon monoxide detector installed within 15 feet of any sleeping area. The act states it must be an approved alarm.
There are three different types of alarms that are deemed acceptable. Your alarm can be battery operated, plug-in with a battery back-up or can be wired into the AC power line with a second battery back-up. You can use a combination smoke detector/carbon monoxide unit but it must follow State Fire Marshall's requirements, has to be labeled by a nationally recognized testing lab and needs to comply with the most recent standards of the Underwriters Laboratory (this would be the UL symbol).
It is required that the owner of the building needs to install the alarms but in rental units the tenants are responsible for keeping them working and making sure the batteries are good. It is a Class B misdemeanor to not follow this ruling. Anyone tampering negatively with an already installed alarm could face a Class A misdemeanor or a Class 4 felony for a 2nd or subsequent conviction.
There are building exclusions but to me it looks like most residential buildings would fall under this act. If you'd like to read this act click here.