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What would happen if I were to lose all equity in my condo when it's time to renew the mortgage?
It doesn't matter.  You will just renew your mortgage at the prevailing rates.  That's part of the mortgage contract.   The problem that happens is if you want to move your mortgage to another bank for a better rate, they may not accept you.  Your re-negotiating position is limited. Most mortgages have a portability option where you can even transfer the mortgage to another property, but you'd have to buy a cheaper house.