Blaming corporations is a cute meme, but it's not the problem. Corporations in this market are NOT monopolistic price-setters, they do not have remarkable market-concentration, and they are not colluding with each other to limit supply. They are competitive price-takers.

If you want to fix housing prices (or if you just want to screw over these corporations for funsies, which is fine) then you want to increase the supply of homes: that is, you want homebuilders to build, build, build, build, build, build, build — and where necessary, you want to drive the political reforms that make this possible. All the evilcorps™ are betting that you won't — and I'd bet that too, given where you're focusing your attention and efforts.