Oh my, where to begin?!  First, foreign procurement of Canadian properties is federal jurisdiction, not municipal.  Second, any kind of meltdown in the Chinese economy will see an increase in demand for hard foreign assets, not a decrease.  And lastly, any impact to the Chinese economy as a result of a Trump tax, will only serve to enrich Americans who will then gobble up more cheap Vancouver properties.

Any way you look at it, you're hooped.