Compared to the rest of the Chicagoland market, the South Loop region has more expensive rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 23 listings have come on the market, which means spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 4% of the listings in the South Loop 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,230 sqft. Most buildings in this area are approximately 3 floors. Most buildings in this region were built in 1920 and are Class B.