Most listings are in the $20's per square foot per year. The Rocklin submarket is going through a a boost in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 25% rise in rent.
Compared to the rest of the Greater Sacramento market, the Rocklin region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 6 listings have been made available, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 2,400 sqft. Most buildings in this area are close to 1 floors. Most buildings in this area were built in 2004 and are Class B.