The typical asking rate per listing is in the $10's per square foot per year. The North Valley region is going through a an increase in rates. In the last 3 months, the median rate increased $16 per sqft per year.
In the last 90 days, 4 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 75% of the office spaces in the North Valley are subleases, so you might be able to sign a shorter term by taking over a previous 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.
Even though the median size is 6,150 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this region are close to 1 floors. Most buildings in this region were built in 0 and are Class Class B.