I'm sure the fact that there's an increasing trend of empty Chinese investment properties isn't helping. I grew up in Cupertino, and when I visit my parents there, I'm rather shocked at how downhill the neighborhood has gone in parts. It's crazy that these old 70's tract homes go for 1.5 million. Even more insane is that they're bought and then left empty to go downhill. Literally broken windows and paint falling off…
What's needed is a property management firm that caters to these people. There's no reason for houses to sit empty. They're much more economically productive (a nice way to say "profitable") with tenants in them.
A 10-20 year old building in Vancouver will have many units with kitchens that have literally never been used. There's wear and tear and a lot of extra work and risk that comes from renting a place. And as odd as it may sound, the resale value can take a hit when a property is "used".
Unlike San Francisco, rents in Vancouver have not gone through the roof. Recently AirBNB seems to have put some upward pressure on rents, but rents still remain fairly detached from capital costs.
Frankly, the rental income is almost a rounding error. Vancouver real estate is about capital, not cash flow. It's a place to store capital (which in and of itself is quite valuable for many foreign owners), and current supply/demand trends also lead to price appreciation.
Traditional views of real estate market fundamentals are nearly irrelevant to the observed behaviour of the Vancouver real estate market.