On average, listings lease in the $40's per square foot per year. The Blackhawk region is going through a a rise in rates. In the last 3 months, the median rate went up $48 per sqft per year.
Compared to the rest of the East Bay market, the Blackhawk submarket has higher rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 1 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 250 sqft. Most properties in this area are around 2 floors. Most buildings in this area were built in 1989 and are Class A.