(c) A landlord who holds a security deposit or prepaid rent pursuant to this section for more than six months shall pay interest to the tenant accruing from the beginning date of the rental term specified in the rental agreement at the rate determined in accordance with Section 5-12-081 for the year in which the rental agreement was entered into. The landlord shall, within 30 days after the end of each 12-month rental period, pay to the tenant any interest, by cash or credit to be applied to the rent due.
(d) The landlord shall, within 45 days after the date that the tenant vacates the dwelling unit or within seven days after the date that the tenant provides notice of termination of the rental agreement pursuant to Section 5-12-110(g), return to the tenant the security deposit or any balance thereof and the required interest thereon; provided, however, that the landlord, or successor landlord, may deduct from such security deposit or interest due thereon for the following:
(1) Any unpaid rent which has not been validly withheld or deducted pursuant to state or federal law or local ordinance; and