On average, listings lease in the $10's per square foot per year. The Janesville region is experiencing a a boost in rates. In the last 3 months, the median rate increased $18 per sqft per year.
In the last 90 days, 31 listings have been posted online, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 71% of the office spaces in the Janesville are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,100 sqft. Most properties in this area are around 2 floors. Most buildings in this region were built in 1979 and are Class B.