What penalty fees can I charge? (Chicago)

[Esther Page]

Hi All,

How and what am I allowed to charge in the way of penalty fees to tenants in Chicago? Our rental is owner-occuipied, so I'm really just thinking about 1) fee for pet that is not on the lease (we allow pets), 2) fee for trashing/not cleaning up the common spaces (yard/stairwell) 3) fee for storing items in utility rooms/inappropriate places outside the unit. 

Can I do that? I'm not trying to be a tyrant, but after reading through the CRLTO (which yes, I know, doesn't apply to me) it seems like all I can do is sit pretty and wait until the end of the lease, or evict (which is a HUGE PAIN in Chicago. 

All thoughts are appreciated. Currently playing around with the free DOMU lease.