Most listings are in the $10's per square foot per year. The Jefferson Park submarket is going through a decline in rates. In the last 3 months, the median rate decreased $9 per sqft per year. That's a 35% decrease in rent.
Compared to the rest of the Chicagoland market, the Jefferson Park submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 3 listings have been made available, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 9,000 sqft, there are still 0 leases below 2,000 sqft. Most properties in this market are around 1 stories. Most buildings in this market were built in 1950 and are Class A.