N.Y. Comp. Codes R. & Regs. tit. 22 § 691.10 : JUDICIARY — Courts — Supreme Court — Second Judicial Department — Appellate Division — Special Rules — Conduct Of Attorneys — Conduct of disbarred, suspended or resigned attorneys; abandonment of practice by attorney

(a) Compliance with Judiciary Law. Disbarred, suspended or resigned attorneys-at-law shall comply fully and completely with the letter and spirit of sections 478, 479, 484 and 486 of the Judiciary Law relating to practicing as attorneys-at-law without being admitted and registered, and soliciting of business on behalf of an attorney-at-law and the practice of law by an attorney who has been disbarred, suspended or convicted of a felony.
(b) Compensation. A disbarred, suspended or resigned attorney may not share in any fee for legal services performed by another attorney during the period of his removal from the bar. A disbarred, suspended or resigned attorney may be compensated on a quantum meruit basis for legal services rendered and disbursements incurred by him prior to the effective date of the disbarment or suspension order or of his resignation. The amount and manner of payment of such compensation and recoverable disbursements shall be fixed by the court on the application of either the disbarred, suspended or resigned attorney or the new attorney, on notice to the other as well as on notice to the client. Such applications shall be made at special term in the court wherein the action is pending or at special term in the Supreme Court in the county wherein the moving attorney maintains his office if an action has not been commenced. In no event shall the combined legal fees exceed the amount the client would have been required to pay had no substitution of attorneys been required.
(c) Notice to clients not involved in litigation. A disbarred, suspended or resigned attorney shall promptly notify, by registered or certified mail, return receipt requested, all clients being represented in pending matters, other than litigated or administrative matters or proceedings pending in any court or agency, of his disbarment, suspension or resignation and his consequent inability to act as an attorney after the effective date of his disbarment, suspension or resignation and shall advise said clients to seek legal advice elsewhere.
(d) Notice to clients involved in litigation.
(1) A disbarred, suspended or resigned attorney shall promptly notify, by registered or certified mail, return receipt requested, each of his clients who is involved in litigated matters or administrative proceedings, and the attorney or attorneys for each adverse party in such matter or proceeding, of his disbarment, suspension or resignation and consequent inability to act as an attorney after the effective date of his disbarment, suspension or resignation. The notice to be given to the client shall advise of the prompt substitution of another attorney or attorneys in his place.
(2) In the event the client does not obtain substitute counsel before the effective date of the disbarment, suspension or resignation, it shall be the responsibility of the disbarred, suspended or resigned attorney to move pro se in the court in which the action is pending, or before the body in which an administrative proceeding is pending, for leave to withdraw from the action or proceeding.
(3) The notice given to the attorney or attorneys for an adverse party shall state the place of residence of the client of the disbarred, suspended or resigned attorney. In addition, notice shall be given in like manner to the Office of Court Administration of the State of New York in each case in which a retainer statement has been filed.
(e) Conduct after entry of order. The disbarred, suspended or resigned attorney, after entry of the disbarment or suspension order or after entry of the order accepting the resignation, shall not accept any new retainer or engage in any new case or legal matter of any nature as attorney for another. However, during the period between the entry date of the order and its effective date he may wind up and complete, on behalf of any client, all matters which were pending on the entry date.
(f) Filing proof of compliance and attorney's address. Within 10 days after the effective date of the disbarment or suspension order or the order accepting the resignation, the disbarred, suspended or resigned attorney shall file with the clerk of the Appellate Division for the Second Judicial Department an affidavit showing:
(1) that he has fully complied with the provisions of the order and with these rules; and
(2) that he has served a copy of such affidavit upon the petitioner or moving party.

Such affidavit shall also set forth the residence or other address of the disbarred, suspended or resigned attorney where communications may be directed to him.

(g) Appointment of attorney to protect clients' interests and interests of disbarred, suspended or resigned attorney. Whenever it shall be brought to the court's attention that a disbarred, suspended or resigned attorney shall have failed or may fail to comply with the provisions of subdivision (c), (d) or (f) of this section, this court, upon such notice to such attorney as this court may direct, may appoint an attorney or attorneys to inventory the files of the disbarred, suspended or resigned attorney and to take such action as seems indicated to protect the interests of his clients and for the protection of the interests of the disbarred, suspended or resigned attorney.
(h) Disclosure of information. Any attorney so appointed by this court shall not be permitted to disclose any information contained in any file so inventoried without the consent of the client to whom such file relates except as necessary to carry out the order of this court which appointed the attorney to make such inventory.
(i) Fixation of compensation. This court may fix the compensation to be paid to any attorney appointed by it under this section. The compensation may be directed by this court to be paid as an incident to the costs of the proceeding in which the charges are incurred and shall be charged in accordance with law.
(j) Required records. A disbarred, suspended or resigned attorney shall keep and maintain records of the various steps taken by him under this Part so that, upon any subsequent proceeding instituted by or against him, proof of compliance with this Part and with the disbarment or suspension order or with the order accepting the resignation will be available.
(k) Abandonment of practice by attorney. When, in the opinion of this court, an attorney has abandoned his practice, this court, upon such notice to such attorney as it may direct, may appoint the chief counsel of the appropriate joint bar association grievance committee, or an individual attorney, to take custody and inventory the files of such attorney and to take such action as seems indicated to protect the interests of his clients.

N.Y. Comp. Codes R. & Regs. Tit. 22 § 691.10