Compared to the rest of the Chicagoland market, the Willowbrook region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 6 listings have come on the market, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 50% of the available leases in the Willowbrook 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,510 sqft. Most buildings in this market are around 1 stories. Most buildings in this region were built in 1979 and are Class B.