Most listings are in the $10's per square foot per year. The Wheeling submarket is going through a an increase in rates. In the last 3 months, the median rate went up $20 per sqft per year.
Compared to the rest of the Chicagoland market, the Wheeling submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 4 listings have been posted online, which means listings might be going fast. You'll want to be prepared to make an offer immediately. About 175% of the available leases in the Wheeling 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,990 sqft. Most properties in this area are around 1 stories. Most buildings in this region were built in 1982 and are Class B.