Every lease is a contract, and every contract has terms both sides agreed to follow. When a tenant breaks one of those terms, that's a lease violation. The tricky part for Illinois landlords isn't spotting bad behavior. It's knowing which violations are backed by state law, which fall under a local ordinance like the Chicago RLTO or the Cook County RTLO, and which ones simply live in the lease itself. Mix that up and you can lose
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