Most listings are in the $30's per square foot per year. The West Side submarket is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 2% increase in rent.
Compared to the rest of the Chicagoland market, the West Side region has greater rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 37 listings have been made available, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 8% of the available leases in the West Side are subleases, so you will probably have to focus your search on direct office leases. 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 3,060 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this market are close to 3 floors. Most buildings in this region were built in 1926 and are Class B.