B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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52. A lawyer who ceases to act for a client must take the necessary conservatory measures to spare the client serious and foreseeable prejudice. In particular, the lawyer must:
(1)  promptly deliver to him all documents and property to which he is entitled;
(2)  give him all the information he has with respect to the mandate;
(3)  account to him for all funds he held or holds in trust, including the refund of any advance;
(4)  promptly inform him about his unpaid fees and disbursements; and
(5)  make all reasonable efforts to facilitate the transfer of his file to the lawyer succeeding him and cooperate with the successor lawyer for that purpose.
O.C. 129-2015, s. 52.