Pretty much all cities above a certain size, at least in the "west". Not sure how it's on other parts of the planet. Populations are migrating to cities en mas

Pretty much all cities above a certain size, at least in the "west". Not sure how it's on other parts of the planet. Populations are migrating to cities en masse, which creates huge demand for city housing. And most cities haven't really been keeping up with the supply side since the 1930s or so.