So how does the process of adding housing units work? If there's space as the article claims, and plenty of demand, whats holding things up? Bureaucracy? I'd like to see reasonable prices sometime in my life !
A lot of people who bought their single-family homes years or decades ago now live in appealing low-density neighborhoods with home values that are sky-rocketing. They don't want their neighborhoods to change into concrete canyons, and the ever-rising values of their homes fund their retirements very nicely. They therefore fight any attempt to increase density by loosening zoning laws.
This behavior is exacerbated by how California handles its property taxes. Essentially, the property taxes on a home are fixed at the value of the home when you bought it, meaning people living in homes that have increased in value are paying disproportionately low property taxes. This tends to discourage people from moving, thereby reducing the liquidity of the home market.