Legal Question in Landlord & Tenant Law in Illinois

Roaches and other vermin are pretty smart - you 'bomb' in your unit and they just move to the next one, and then back.... So this takes a coordinated effort. If the landlord isn't addressing it properly, or is blaming anyone (like you, for instance) for the infestation, that's a problem. As to whether or not you have a 'lease' if you gave the money after receiving the lease form if I was the landlord I'd say you accepted the place on the basis of the lease so there is one unless the lease itself says it is not effective until both sign off on it or there is other language that may help you - so take the lease, with your information, and talk to an attorney - among other things you may have to give notice of "constructive eviction" and may expose yourself to a claim for rent that would have to defend on the basis of lack of habitability. And depending on other factors you may just have a month-to-month tenancy but this also would need to be addressed and terminated. The lease may also attempt to limit damages (medical costs for the resulting illnesses) and this may be an insurance issue. Again an attorney can help you sort through this, but don't wait because the longer you live there and don't take action, it can 'hurt your case'.