On average, listings lease in the $10's per square foot per year. The Gurnee region is experiencing a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 15% decline in rent.
Compared to the rest of the Chicagoland market, the Gurnee region has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 2 listings have been listed, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 600 sqft. Most properties in this area are around 3 stories. Most buildings in this market were built in 1996 and are Class B.