On average, listings lease in the $10's per square foot per year. The Barrington region is seeing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 7% decline in rent.
Compared to the rest of the Chicagoland market, the Barrington submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 33 listings have been posted online, which means new listings most likley are leasing quickly. 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 2,110 sqft. Most buildings in this region are close to 2 stories. Most buildings in this area were built in 1984 and are Class B.