On average, listings lease in the $10's per square foot per year. The Westmont submarket is going through a a boost in rates. In the last 3 months, the median rate rose $17 per sqft per year.
Compared to the rest of the Chicagoland market, the Westmont submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 23 listings have been made available, which means new listings might be going fast. You'll want to be prepared to make an offer immediately. About 104% of the office spaces in the Westmont are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,040 sqft. Most buildings in this region are close to 1 floors. Most buildings in this market were built in 1986 and are Class B.