If someone buys three houses with same go, I think it is pretty clear he's not gonna live in them.
It's interesting that a 15% tax pushed the guy to buy in another country where the local currency is almost 40% stronger... That considered, I think the real reason here is much cheaper houses in Seattle and not the foreign tax at all. 1-2 million houses in Bellevue are much more opulent than in West Vancouver / Vancouver Westside teardowns...