The typical asking rate per listing is in the $10's per square foot per year. The Oakland region is seeing a a rise in rates. In the last 3 months, the median rate increased $18 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the office spaces in the Oakland are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,110 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 1989 and are Class B.