It's never coming back down, corporations figured out it was a choice between a finite sum of money through selling, or indefinite income through renting. So they've been buying up property like crazy and outbidding anyone actually trying to live somewhere, of course corporation is gonna have more money and the RoI is virtually infinite no matter the price.
This is only a small part of the problem. The issue is that corporations are bidding on an extremely limited number of lots. Like a hundred firms on five lots kinda insane. By bidding on each other over and over, the prices inflate, and the end result ends up having to rake in more money just to recoup the costs.
It's just plain illegal to build multiplexes on single lot residential. That's why you can get several square km in the middle of downtown of only single family houses with front and back yards, with 50 story sky scrapers a few blocks down.
This is exactly how prices work. The minimum price of something is the price at which something costs to procure and produce, with anything added on top being profits. And this being typical western capitalism, they do what they can to increase profits as much as possible, and with housing being a requirement not a luxury, people pay whatever is asked.