It's just the recent trend. And property prices will take a dive sooner or later. An interesting graph to keep in mind is [Amsterdam house prices](http://imgur.com/eGAE3BW) adjusted for purchasing power the last 400 years. As can be seen, we just two years ago passed the all-time which ended with the Dutch Golden Age. The event that will cause the current market to collapse is not clear yet. But it undoubtedly will happen.