Most listings are in the $20's per square foot per year. The Arlington Heights region is going through a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 8% decline in rent.
Compared to the rest of the Chicagoland market, the Arlington Heights region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 38 listings have been posted online, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,080 sqft. Most properties in this market are close to 1 stories. Most buildings in this region were built in 1985 and are Class A.