Compared to the rest of the Chicagoland market, the Wheaton region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 72 listings have been listed, so you'll want to check back regularly for new listings. 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 460 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1988 and are Class B.