Compared to the rest of the Chicagoland market, the Wheaton region has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 126 listings have come on the market, so you'll want to check back regularly for new listings. About 2% of the listings in the Wheaton are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 640 sqft. Most properties in this market are approximately 2 floors. Most buildings in this area were built in 1988 and are Class B.