The typical asking rate per listing is in the $20's per square foot per year. The La Grange region is going through a an increase in rates. In the last 3 months, the median rate went up $25 per sqft per year.
Compared to the rest of the Chicagoland market, the La Grange submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 4 listings have been made available, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 25% of the available space in the La Grange 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 1,600 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1960 and are Class B.