A vendor who serves a notice to complete making time essential must itself be ready, willing and able to complete by the essential date, including by providing a transfer duly executed in registrable form. A vendor cannot rely on the purchaser's failure to serve a transfer in the correct form for corporate execution as a basis for termination where the vendor's own failure to properly execute the transfer (and arrange its mortgagee) rendered it unable to complete. The prevention principle does not convert a purchaser's non-essential breach into an essential breach, but it may preclude the purchaser from terminating where its breach contributed to the vendor's default.
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