The typical asking rate per listing is in the $10's per square foot per year. The Northwest Side region is going through a decline in rates. In the last 3 months, the median rate decreased $9 per sqft per year. That's a 32% decrease in rent.
Compared to the rest of the Chicagoland market, the Northwest Side submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 57 listings have come on the market, so you'll want to check back regularly for new listings. About 2% of the office spaces in the Northwest 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 posted, 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 2 stories. Most buildings in this region were built in 1950 and are Class A.