On average, listings lease in the $20's per square foot per year. The Arlington Heights region is going through a an increase in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 3 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 133% of the available space in the Arlington 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.
Even though the median size is 3,910 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this market are close to 2 floors. Most buildings in this region were built in 1955 and are Class B.