Property taxes are another way that California is extremely regressive. Since property tax is paid based on the purchase price rather than market value like in other places, and since adding additional housing means that your property tax gets reassessed at the new value, tax policy highly incentivizes reduction of housing supply.
California policy can be summed up as: "I don't want any more people here after I moved here; but please bring on the jobs and the rising property values."
On the east coast, we just call that "fuck you, I got mine."
We should buy housing to live in, not to extract rent from the suckers that were too late. A land value tax would help lower prices and remove the incentive to treat housing as an income source.
Also, I'm not sure what "devaluing" is going on; by pure financial value there's almost no way to build enough to actually drive down the price of any individual home; more likely as zoning increases the home will go up in value, but individual condos or townhouses will be available for much less than a single family home.
If you mean "devaluing" by "I now have apartments on the block," there's absolutely no right whatsoever for somebody to control the use of that other property.
This ... kind of ... happened in Southern California in the early 1990s when the defence industry retrenched. SoCal housing prices had long led NoCal, and in the aftermath the south's values fell by a third or so. They've never really caught up. A different dynamic but similar result. Oddly, a consequence has been somewhat greater densification of the LA basin.
You could look at real estate in other and earlier times, especially industrial or extractive areas after the boom has passed.
This is a really biased view of what landlords do. A landlord takes on all the risk of maintaining the home, staying in the home long-term, fixing things when things break, etc. As a renter, being able to just tell my landlord when things break means that much more convenience for myself. Moreover, as a renter, having no incentive to be gentle on my appliances, my landlord actually does quite a bit of stuff (Or pays a lot to have someone else do my stuff, hence creating a job) to make my life pretty darn easy.
But it is important to call it what it is and not be distracted by their nonsensical reasoning. They want less development because they want their housing values to increase. And in this process, they don't care about the lives of other people who'd want to move here or about the long term negative consequences of reduced growth and economic activity as a result of their greed.
Think of all of the companies that don't get started or the things that don't get invented because they simply can't get the workers they need -- It is a sort of 'negative externality', little different from pollution or lung cancer, of the reliance on housing equity to fuel savings that we've come to rely on.
The rampant NIMBYism hurts renters by constraining supply as well as well. Even if you don't want to own, you're still suffering.
(Though honestly I think the rental prices are lagging behind a bit. The home prices have truly become insane; I just watched a 4 bedroom in Burlingame that was bought for $2.3M in Oct 2017 sell for $5.1M; i.e., a 118% return in 15 months.)