Most listings are in the $10's per square foot per year. The Lombard region is going through a a rise in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% increase in rent.
Compared to the rest of the Chicagoland market, the Lombard region has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 86 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the available leases in the Lombard are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 1,560 sqft. Most buildings in this market are close to 1 stories. Most buildings in this region were built in 1983 and are Class B.