Compared to the rest of the Chicagoland market, the Oak Brook region has higher rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 70 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the available leases in the Oak Brook 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 1,530 sqft. Most buildings in this area are around 3 floors. Most buildings in this market were built in 1979 and are Class A.