Most listings are in the $20's per square foot per year. The Deerfield submarket is going through a an increase in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 15% increase in rent.
Compared to the rest of the Chicagoland market, the Deerfield region has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 17 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 53% of the office spaces in the Deerfield are subleases, so you might be able to snag a great spot on a short term. 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 3,180 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are close to 4 stories. Most buildings in this market were built in 1986 and are Class A.