Most listings are in the $10's per square foot per year. The Des Plaines submarket is seeing a decrease in rates. In the last 3 months, the median rate decreased $10 per sqft per year. That's a 34% decline in rent.
Compared to the rest of the Chicagoland market, the Des Plaines region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 23 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,900 sqft. Most properties in this region are around 2 stories. Most buildings in this market were built in 1973 and are Class B.