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 undervalued region.
In the last 90 days, 3 listings have been posted online, which means new listings most likley are leasing quickly. 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 2,500 sqft. Most properties in this region are around 1 stories. Most buildings in this area were built in 1973 and are Class B.