The typical asking rate per listing is in the $20's per square foot per year. The Mundelein submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $26 per sqft per year.
Compared to the rest of the Chicagoland market, the Mundelein submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 9 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 33% of the available leases in the Mundelein 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 900 sqft. Most buildings in this region are close to 1 stories. Most buildings in this area were built in 1987 and are Class B.