Interesting. Here in the San Francisco Bay Area, the poor fled to the suburbs across the bay, bringing poverty and crime with them. Meanwhile, middle-class and upper-class folks either fled further out east to the Sierra foothills, further north or south. Or, they moved back to SF. At one time, SF had high-rise projects for the poor. They've been demolished, the ghettos are disappearing. And new high-rise towers for the rich were built. Probably happening to other cities as well. Towers for the rich, that the poor can't afford.
That is precisely what has been happening in Toronto for the past couple of decades. The amount of new housing going up in the downtown core is staggering, and people are willing to pay upwards of $250k for a one-bedroom condo.