Earlier quoted context omitted.
> Is that an externality of AirBnB or poor city planning? I'd say both. Poor city planning leads to it happening, but AirBnB exacerbates the problem. And for a politician, regulating AirBnB is much easier and a lot more understandable by the electorate. Explaining how they should be reelected because of changes they made to fundamental housing policy that will take 30 years to materialize is a hard sell.
It doesn't take 30 years to build new homes. As soon as California forced cities to allow ADUs they were built in large numbers. Add duplexes, three plexes, etc and we'll get even more. The thing about regulating symptoms is that it's cathartic without accomplishing much.
I was reading an article about a city that was upzoned in the 70s which I can't find now, but the gist of it was that everyone was worried the upzoning would change everything. In reality, in the 40 years since, only a few single family homes were torn down and replaced with multi-unit dwellings. Most of the land sales were still from one single family owner to another.