On average, listings lease in the $10's per square foot per year. The Oak Forest submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $18 per sqft per year. That's a Inf% increase in rent.
Compared to the rest of the Chicagoland market, the Oak Forest region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been listed, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. 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 630 sqft. Most properties in this market are close to 1 stories. Most buildings in this market were built in 1978 and are Class B.