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

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92. A lawyer must not act as surety or otherwise provide security for a debt in respect of which a client is a borrower or lender.
However, a lawyer may act as surety or otherwise provide security in the following cases:
(1)  the lender is a financial institution or a similar enterprise whose business includes lending money to the public, and the lender is providing funds to the lawyer or the lawyer’s spouse, parent, or child;
(2)  he is doing so for the benefit of a non-profit organization of which he is a supporter or member, provided the following conditions have been met:
(a)  the lawyer complies with sections 90 and 91; and
(b)  the non-profit organization is represented by an independent lawyer;
(3)  the lawyer holds an interest in a commercial enterprise with a client and the lender requires personal guarantees from all the partners or shareholders of the enterprise as a matter of course, provided the following conditions have been met:
(a)  the lawyer complies with sections 90 and 91; and
(b)  the lender and the partners or shareholders of the enterprise who are or were clients of the lawyer have independent legal representation.
O.C. 129-2015, s. 92.