On average, listings lease in the $10's per square foot per year. The Oak Forest region is seeing a an increase in rates. In the last 3 months, the median rate rose $18 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the Chicagoland market, the Oak Forest submarket has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been made available, which means office spaces 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 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 region are close to 1 stories. Most buildings in this area were built in 1978 and are Class B.