Most listings are in the $20's per square foot per year. The Des Plaines submarket is going through a a rise in rates. In the last 3 months, the median rate went up $20 per sqft per year.
Compared to the rest of the Chicagoland market, the Des Plaines region has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 26 listings have been made available, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 88% of the listings in the Des Plaines 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,380 sqft. Most buildings in this area are close to 2 stories. Most buildings in this region were built in 1973 and are Class B.