The typical asking rate per listing is in the $20's per square foot per year. The Rosemont submarket is going through a a rise in rates. In the last 3 months, the median rate rose $24 per sqft per year.
Compared to the rest of the Chicagoland market, the Rosemont submarket has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 16 listings have been posted online, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 138% of the available leases in the Rosemont are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 11,670 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this region are close to 11 floors. Most buildings in this market were built in 1988 and are Class A.