it differs from community to community here. Berkeley has very strict rent control but just on the northern border in Albany and El Cerrito, not so much. But still, I haven't seen rent raise like that.
In South Bay I think there is much less control. $200 per year doesn't seem that odd, but a 6 month lease, so $500/year, that is insane. Rent is absolutely nuts around here, but going up $1k in a matter of 2 years?
That doesn't seem normal at all, even for this area. Now, signing a new lease with new tenants, and rent going up 40% or 50% and more from what the previous tenant was paying...that is also normal.