Because housing has been commodified and is being redirected en masse to the short term rental market as profits are higher than with long term tenants. This state is filled with landlords who don't care about having functioning, working communities because the DINKWADs on vacation are willing to spend a mortgage payment on two nights in Portland.

These landlords are both local and from away. They're all opportunists, and one of the two is happy to let the other group suffer all the scorn.