On average, listings lease in the $20's per square foot per year. The Addison region is going through a an increase in rates. In the last 3 months, the median rate went up $5 per sqft per year. That's a 20% increase in rent.
Compared to the rest of the Chicagoland market, the Addison region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 10 listings have come on the market, which means leases 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 posted, so finding a space for a small business might be tough.
Even though the median size is 5,790 sqft, there are still 0 leases below 2,000 sqft. Most properties in this area are around 1 stories. Most buildings in this region were built in 1985 and are Class B.