Compared to the rest of the Chicagoland market, the Warrenville region has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 9 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 44% of the available leases in the Warrenville are subleases, so you might be able to snag a great spot on a short term. 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 2,400 sqft. Most buildings in this market are close to 2 stories. Most buildings in this market were built in 1997 and are Class B.