This is clearly a case of common mistake. Furthermore the mistakes are obvious and all the essentials for rectification of written agreements are present. (See Snell’s Principles of Equity, 28th edition, 1982, Chapter 4, and Juliar v. Canada (Attorney General) [1993] O.J. 3554.) The fact that part performance has occurred does not preclude rectification, because part performance has not prejudiced the parties, or obscured the elements that require rectification.
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