Most listings are in the $40's per square foot per year. The Danville region is seeing a an increase in rates. In the last 3 months, the median rate went up $17 per sqft per year. That's a 63% increase in rent.
Compared to the rest of the East Bay market, the Danville submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 5 listings have come on the market, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 580 sqft. Most buildings in this area are around 2 stories. Most buildings in this region were built in 1982 and are Class B.