Lots of global cities do have bubbles from foreign investment parking wealth in property, driving up prices and squeezing out locals looking to buy. Here's how it works:
Foreign investors buy luxury properties
Top-tier locals can't buy luxury properties, buy the next highest property class
Second-tier etc.
Lower-rung locals have no properties to buy. Not: they don't have enough money; but the property type they would traditionally occupy isn't available, and no alternatives have been built since it's always in a developer's best interest to aim at the top, in the abscesses of government incentives.