Most listings are in the $20's per square foot per year. The Grass Valley region is going through a an increase in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 17% increase in rent.
Compared to the rest of the Greater Sacramento market, the Grass Valley region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 5 listings have been made available, which means new availabilities are probably 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.
Even though the median size is 2,720 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1990 and are Class A.