the article lacks the major fuel of the current housing bubble in US/CA: the Chinese buyers. there is an estimated $500B capital outflow from China in 2015. guess a large part of that is in SF/BC/NYC/London real estate.
Massive outflows from China the last couple of years. Encourage funds into the UK, mostly London, property market. Build huge number of new homes with Chinese money. Once (hopefully) the market crashes, glut of thousands of relatively affordable properties become available.
I am not sure whether this was purposeful, however I have stopped complaining about foreign funded real estate investment here as it will be extremely fruitful if the bubble pops. Unfortunately for those in the states mentioned, it seems the money isn't going into building new properties, but inflating a low and severely restricted stock.