Most listings are 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% rise in rent.
Compared to the rest of the Chicagoland market, the Addison submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 9 listings have been made available, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 5,790 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this market are around 1 stories. Most buildings in this area were built in 1985 and are Class B.