N.Y. Comp. Codes R. & Regs. tit. 3, § 79.6
(b) If the mortgagor fails to maintain the real property securing the reverse mortgage loan in accordance with subsection (a) the mortgagee may arrange for such maintenance upon receiving consent to enter upon the premises, which is not to be unreasonably withheld by the mortgagor. Notwithstanding applicable state and federal rules and laws, a mortgagee may pay for maintenance work done in accordance with this section in the following ways:
(3) by adding the amount to the loan principal.
If a set aside account has been established, then, to the extent possible, the mortgagee must deduct the cost of the repair from such fund before choosing option paragraph (2) or (3) of this subdivision. If a set aside account has not been established, then the mortgagee may choose whether to proceed according to option paragraph (2) or (3) of this subdivision or a combination thereof.