The typical asking rate per listing is in the $20's per square foot per year. The Wheaton submarket is experiencing a an increase in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 1% increase in rent.
Compared to the rest of the Chicagoland market, the Wheaton region has greater rates, and you'll need to make a great offer to be in this hot region.
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 available space 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 390 sqft. Most properties in this region are around 2 floors. Most buildings in this region were built in 1988 and are Class B.