(b) A landlord, lessor, sub-lessor or grantor may charge a fee or fees to reimburse costs associated with conducting a background check and credit check, provided the cumulative fee or fees for such checks is no more than the actual cost of the background check and credit check or twenty dollars, whichever is less, and the landlord, lessor, sub-lessor or grantor shall waive the fee or fees if the potential tenant provides a copy of a background check or credit check conducted within the past thirty days. The landlord, lessor, sub-lessor or grantor may not collect the fee or fees unless the landlord, lessor, sub-lessor or grantor provides the potential tenant with a copy of the background check or credit check and the receipt or invoice from the entity conducting the background check or credit check. 2. No landlord, lessor, sub-lessor or grantor may demand any payment, fee, or charge for the late payment of rent unless the payment of rent has not been made within five days of the date it was due, and such payment, fee, or charge shall not exceed fifty dollars or five percent of the monthly rent, whichever is less. 3. Any provision of a lease or contract waiving or limiting the provisions of this section shall be void as against public policy.