The typical asking rate per listing is in the $10's per square foot per year. The Palos Heights submarket is going through a an increase in rates. In the last 3 months, the median rate went up $16 per sqft per year.
Compared to the rest of the Chicagoland market, the Palos Heights region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 4 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 50% of the office spaces in the Palos Heights 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,850 sqft. Most buildings in this market are around 1 floors. Most buildings in this area were built in 1973 and are Class B.