No, CRA doesn't allow MPAC property assessments to demonstrate FMV.
As per CRA:
fair market value is normally the highest price that the property could bring in if the market was open and unrestricted and the buyer and seller are both willing, knowledgeable, informed, prudent, and independent of one another
For the change in use (and non-arm's length transactions), it is recommended that you pay ~$100 for an appraiser to come and appraise your home. MPAC assessments are not accepted as reliable indicators of FMV.
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