The typical asking rate per listing is in the $10's per square foot per year. The Sun Prairie region is experiencing a a rise in rates. In the last 3 months, the median rate increased $16 per sqft per year.
In the last 90 days, 5 listings have come on the market, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. About 80% of the available leases in the Sun Prairie 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,080 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1982 and are Class B.