The typical asking rate per listing is in the $10's per square foot per year. The Franklin Park region is experiencing a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
Compared to the rest of the Chicagoland market, the Franklin Park region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 10 listings have been listed, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,500 sqft. Most properties in this region are around 1 stories. Most buildings in this market were built in 1973 and are Class B.