Most listings are 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 rose $16 per sqft per year.
Compared to the rest of the Chicagoland market, the Palos Heights submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 4 listings have come on the market, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 25% of the listings in the Palos Heights are subleases, so you might be able to find a shorter term or below market rent. 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 1,800 sqft. Most properties in this region are close to 1 floors. Most buildings in this region were built in 1973 and are Class B.