Ah, from your original comment, I thought you were advocating for seizure + rent control.
If you are instead suggesting some form of eminent domain of low density housing, and then building higher density housing in its stead, with a target of 40% of housing controlled by the state, I'm more inclined to think that would work.
To my mind though, I think targeting meeting current demand + demand growth (or some margin therein) would be the target, rather than what feels to me the arbitrary target of 40% (unless you have figures that show that's where demand+growth meets.)
If you are instead suggesting some form of eminent domain of low density housing, and then building higher density housing in its stead, with a target of 40% of housing controlled by the state, I'm more inclined to think that would work.
To my mind though, I think targeting meeting current demand + demand growth (or some margin therein) would be the target, rather than what feels to me the arbitrary target of 40% (unless you have figures that show that's where demand+growth meets.)