The typical asking rate per listing is in the $20's per square foot per year. The Humboldt Park region is experiencing a a boost 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 smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 6 listings have come on the market, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 17% of the available space in the Humboldt Park are subleases, so you might be able to find a shorter term or below market rent. 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 area are close to 3 stories. Most buildings in this region were built in 1950 and are Class B.