Most listings are in the $20's per square foot per year. The Rosemont submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 6% decline in rent.
Compared to the rest of the Chicagoland market, the Rosemont region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 12 listings have been made available, which means new availabilities most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 8% of the listings in the Rosemont are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,610 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are around 12 stories. Most buildings in this region were built in 1988 and are Class A.