Residential buildings stand in the Choi Hung, front, and Kowloon Bay district of Hong Kong, China, on Tuesday, Aug. 25, 2015.

Hong Kong's ever-climbing property prices have long made the city a global posterchild for unaffordable housing, but there are signs change may be afoot, if buyers would just believe it.

Hong Kong's property prices have more than doubled since 2009, consistently ranking the city among the world's most expensive property markets. But now, property prices are "quite vulnerable. It's going up only because of a general consensus that it will go up," Nicole Wong, an analyst at CLSA, said recently.