Most listings are in the $30's per square foot per year. The Near West Side region is going through a an increase in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 27% rise in rent.
Compared to the rest of the Chicagoland market, the Near West Side region has greater rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 19 listings have been posted online, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 5% of the office spaces in the Near 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.
The standard measurement for office space in this area is around 2,100 sqft. Most buildings in this area are approximately 5 floors. Most buildings in this area were built in 1925 and are Class B.