The typical asking rate per listing is in the $20's per square foot per year. The Barrington region is going through a a boost in rates. In the last 3 months, the median rate increased $6 per sqft per year. That's a 30% rise in rent.
Compared to the rest of the Chicagoland market, the Barrington submarket has higher rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 25 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,230 sqft. Most properties in this area are around 2 stories. Most buildings in this market were built in 1984 and are Class B.