"Vancouver is now on the rebound after slumping in the immediate aftermath of B.C.’s measures."

True.  But in case you wondered why... 
1. The "slump" wasn't entirely due to B.C.'s "measures", including the 15% tax. (In fact, foreign buyer figures increased steadily for close to 4 months after the tax first went into effect.)  What happened THEN: China initiated 2-3 rounds of regulatory clampdowns on fleeing capital--clamp-downs SPECIFICALLY aimed at purchases of foreign real estate.  That did it. So did "wait and see" attitudes on behalf of both buyers and sellers. 

2. So: foreign buyer pool dries up.  What causes "the rebound", then?  All the OTHER factors that those scapegoating foreign buyers often conveniently overlook.  Changes have been slow there...in fact, some can't be changed, like the fact that tens of thousands of mostly Canadians continue to move INTO the area each year, looking to buy...something.