On average, listings lease in the $20's per square foot per year. The Bannockburn submarket is going through a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 18% decrease in rent.
Compared to the rest of the Chicagoland market, the Bannockburn submarket has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 9 listings have come on the market, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 3,870 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this market are around 3 stories. Most buildings in this area were built in 1998 and are Class A.