Most listings are in the $20's per square foot per year. The Woodridge region is going through a a rise in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 11% increase in rent.
Compared to the rest of the Chicagoland market, the Woodridge region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 10 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. 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 2,100 sqft. Most properties in this region are close to 2 floors. Most buildings in this market were built in 2000 and are Class B.