Most listings are in the $10's per square foot per year. The Janesville region is experiencing a decline in rates. In the last 3 months, the median rate fell $8 per sqft per year. That's a 31% decrease in rent.
In the last 90 days, 31 listings have been listed, which means new availabilities 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 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 1,270 sqft. Most buildings in this market are close to 2 stories. Most buildings in this market were built in 1979 and are Class B.