Compared to the rest of the Chicagoland market, the Carol Stream submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 15 listings have been listed, which means office spaces 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 790 sqft. Most properties in this region are around 1 floors. Most buildings in this region were built in 1987 and are Class B.