when setting the amount of the fee; and (F) allow a tenant who agrees to pay a fee to waive a security deposit to opt-out of the obligation to pay such fee if such tenant pays the security deposit that would otherwise be in effect for the tenant's apartment on the day the tenant chooses to opt-out of such fee; provided further, that the sum of fees paid to waive a security deposit and the payment of the security deposit shall not exceed, in total, the amount of 1 month's rent; and provided further, that the executive office shall consult with the office of the attorney general prior to promulgating regulations authorizing a fee in lieu of a security deposit under this section; and,
(iv) the purchase and installation cost for a key and lock.
(c) No lease or other rental agreement shall impose any interest or penalty for failure to pay rent until thirty days after such rent shall have been due.
(d) No lessor or successor in interest shall at any time subsequent to the commencement of a tenancy demand rent in advance in excess of the current month's rent or a security deposit in excess of the amount allowed by this section. The payment in advance for occupancy pursuant to this section shall be binding upon all successors in interest.
(e) A security deposit shall continue to be the property of the tenant making such deposit, shall not be commingled with the assets of the lessor, and shall not be subject to the claims of any creditor of the lessor or of the lessor's successor in interest, including a foreclosing mortgagee or trustee in bankruptcy; provided, however, that the tenant shall be entitled to only such interest as is provided for in subsection (3)(b).
(2)(a) Any lessor or his agent who receives, at or prior to the commencement of a tenancy, rent in advance for the