The typical asking rate per listing is in the $30's per square foot per year. The East Bay region is seeing a a rise in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 7% rise in rent.
Compared to the rest of the East Bay market, the East Bay region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 721 listings have been listed, so you'll want to check back regularly for new listings. About 5% of the available space in the East Bay are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,170 sqft. Most buildings in this region are close to 2 stories. Most buildings in this region were built in 1983 and are Class A.