The typical asking rate per listing is in the $20's per square foot per year. The Humboldt Park submarket is going through a an increase in rates. In the last 3 months, the median rate rose $24 per sqft per year.
Compared to the rest of the Chicagoland market, the Humboldt Park submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 6 listings have been made available, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the available space in the Humboldt Park are subleases, so you might be able to snag a great spot on a short term. 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 400 sqft. Most buildings in this region are approximately 3 floors. Most buildings in this area were built in 1950 and are Class B.