The typical asking rate per listing is in the $10's per square foot per year. The Pleasant Prairie submarket is going through a a boost in rates. In the last 3 months, the median rate rose $17 per sqft per year.
Compared to the rest of the Chicagoland market, the Pleasant Prairie submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 6 listings have been listed, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,350 sqft. Most buildings in this area were built in 1995 and are Class B.