最后一个月的租金实际上属于security deposit。
IL州法没有限制押金是多少,所以你可以要三个月。
Cook county要求押金不超过一个半月的租金。所以你最多签约的时候收两个半月的钱。
https://securitydepositlaw.com/cook-county-rtlo-2/ see
Sec. 42-811 – Security Deposit
A. A landlord may not demand or receive a security deposit in an amount in excess of one and one-half months’ rent. A landlord may not avoid the coverage of this subsection by labeling the fee or charge as anything other than a security deposit.