The typical asking rate per listing is in the $10's per square foot per year. The Wisconsin region is going through a a rise in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 0% rise in rent.
In the last 90 days, 889 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available space in the Wisconsin are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,120 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this market were built in 1982 and are Class B.