Why banning construction won't do a thing but make it worse.

Has already played out in Manhattan and outer neighborhoods of San Francisco.

Most expensive places in America because when you refuse to build more supply, the rich will simply outcompete the poor for bad-quality housing and then renovate it on the inside. That is literally every expensive area of Manhattan. And the ones that don't get renovated, still get bid up anyways, because people don't choose where to move based on whether there's new housing there, else everyone would be moving to Williston ND where a bunch of oil boom housing from 5 years ago sits empty.