On average, listings lease in the $10's per square foot per year. The Janesville region is seeing a a boost in rates. In the last 3 months, the median rate went up $18 per sqft per year.
In the last 90 days, 31 listings have been listed, which means office spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 68% of the available leases in the Janesville are subleases, so you might be able to find a shorter term or below market rent. 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 1,100 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1979 and are Class B.