N.Y. Comp. Codes R. & Regs. tit. 21, § 459.6 – Multiple unit dwelling.

(a) The utility shall not discontinue service to an entire multiple unit dwelling (defined as containing three or more individual dwelling units) where the customer to whom the last preceding bill has been rendered, or from whom or which the utility has received payment therefor, has failed to pay such electric bills until 35 days have elapsed from the date payment was due. Additionally such termination cannot occur until the utility has complied with the following procedures:
1. (1) The utility must give 15 days' written notice of its intention to so discontinue by personally serving such notice on the owner of the premises affected or on the customer to whom the last preceding bill was rendered, or from whom or which the utility has received payment therefor, and on the superintendent or other person in charge of the building, if it can be readily ascertained that there is such superintendent or other person in charge.
2. (2) The utility must give 15 days' written notice by registered or certified letter to the owner or customer specified in paragraph (1) of this subdivision, if such notice is mailed to the address of such person(s), firm or corporation.
3. (3) In addition to the notice prescribed by paragraphs (1) and (2) of this subdivision, 15 days' written notice shall be posted in the public areas of such multiple dwelling; and 15 days' written notice shall be mailed to the occupant of each unit in that multiple dwelling and to the local health officer and director of the social services district for the political subdivision in which the multiple dwelling is located. Notice to health officers and directors of social services shall be repeated not more than four working days nor less than two working days prior to such discontinuance.
4. (4) Whenever a notice of intention to discontinue electric service has been made pursuant to the provisions of this section and obligations owed the utility have been satisfied, the utility shall, in the same manner as it gave such notice of intention, notify the occupant of each unit that the intention to discontinue electric service no longer exists.
(b) Notwithstanding the provision of subdivision (a) of this section, no utility shall discontinue services to a multiple dwelling, where the owner or customer responsible for making payment fails to pay utility bills, as long as occupants of such multiple dwellings continue to make timely payments for such service. All notices referred to in subdivision (a) of this section shall contain the intended date of discontinuance of service and the name and telephone number of a contact at the utility who will advise occupants of the amount due for electric service and who will arrange meetings with occupants to attempt to work out a mechanism for avoiding discontinuance of service in the event that the owner or customer continues to fail to make requisite payments or arrangements for such payments. The notice shall also refer to the provisions contained in subdivision (a) of section 235 of the New York Real Property Law authorizing occupants to set-off, against their rent, payments to utilities in such circumstances.
(c) A utility may not require occupants in a multiple dwelling electing to make payments as detailed in subdivision (b) of this section to pay more than the current electric charges incurred by the owner or customer, to whom or which the last preceding bill has been rendered or from whom or which the utility has received payment therefor. A current charge for purposes of this section means the amount properly billed the owner or customer, for electricity used during the most recent billing period covered by the first bill rendered on or after the date when the disconnect notice is issued. The current charges will not include any arrears for earlier billing periods that may appear on such a bill.