Most listings are in the $20's per square foot per year. The Northwest Side submarket is going through a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% rise in rent.
Compared to the rest of the Chicagoland market, the Northwest Side submarket has greater rates, and you'll need to make a great offer to be in this hot submarket.
In the last 90 days, 31 listings have been listed, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,300 sqft. Most properties in this market are around 2 floors. Most buildings in this market were built in 1952 and are Class A.