terrible idea.
not to mention the political debates/decisions over what constitutes "fully utilized". what about public parks? urban agriculture? so many exceptions.
this would be a nightmare policy to retrofit. maybe a good idea if we had started there first, but we didn't.
it's also an ignorant diagnosis of the issue. land values and speculation is not the issue in my location (burlington, vermont) where we have a housing crisis. there are not many vacant lots (i'm guessing maybe a dozen in the entire municipality).
it's just an overly simplified solution to a complex problem.
here is what i believe to be the superior solution: https://www.npr.org/2024/10/07/nx-s1-5119633/housing-crisis-...