Agree with “adding new units”. But where?
In San Diego, it is not just the price of housing, but the availability. We have been seeing an exodus of people with lower levels of education leaving the area. For those that stay and work in lower paid jobs, they are regularly commuting 40 minutes + to work everyday. They cannot afford to live here. The market is additionally squeezed by the high proportion of holiday homes, retirees and those who rent out their places to vacationers at a premium. Employers that would like to locate here are looking elsewhere because the availability and cost of housing. Construction could be more dense here, but public transport is not nearly as good as in SF (even though the BART does leave things to be desired) and having a car is very necessary.