Yeah I've seen that too, and that's at least one point in my reasoning as well. I am not really sure what factors Zillow is specifically using to predict that, though.

I'm looking to buy a 2br condo somewhere between San Mateo and Santa Clara (inclusive) which should probably be hit the hardest, however even 10% seems not enough - not from an affordability standpoint, but from a value standpoint, I think even with some appreciation it would be better to keep renting. And there must be a limit to how much 1-2 br condo in the area can appreciate, since I assume it will probably always be pegged to at most somewhere around what a local software engineer salary with ~3-10 years of experience could pay for a mortgage. And they are already right around that level.