On average, listings lease in the $30's per square foot per year. The California submarket is going through a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 4% rise in rent.
In the last 90 days, 0 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the office spaces in the California 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 available, so finding a space for a small business might be tough.
Even though the median size is 3,470 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this region were built in 1998 and are Class A.