Most listings are in the $10's per square foot per year. The Darien submarket is experiencing a decrease in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 11% decline in rent.
Compared to the rest of the Chicagoland market, the Darien submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 13 listings have been posted online, which means listings 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 4,515 sqft, there are still 0 listings below 2,000 sqft. Most properties in this market are close to 2 stories. Most buildings in this region were built in 1990 and are Class B.