Taken from a Trulia article:
Rents Continue To Climb, Rising Nationally 5.0 Percent Year-Over-Year
On the ground I find that there is a complete penury of rentals in the area centered around Palo Alto, and that rents have gone up in the Silicon Valley by a lot more than 10% in some cases. It is good to check with your Realtor on the latest values if you are thinking of renting out your property for a while.
I often advise to also check Craigslist's listings.
Francis - on Trulia
Current Mortgage rates