@Daojoan I think he's basically talking about a vacancy tax, which is one tool in the toolbox, but there is no single magic bullet. We need to build much more housing -- I know the area where I live needs to build about 15,000 units per year to keep up with growth.

Over in California, a legal organization that has backed housing reforms has a tracker for cities throughout the state showing whether they're in compliance or not. Most places need to build build build https://cities.fairhousingelements.org/