On average, listings lease in the $20's per square foot per year. The Northbrook submarket is seeing a an increase in rates. In the last 3 months, the median rate increased $0 per sqft per year. That's a 0% increase in rent.
Compared to the rest of the Chicagoland market, the Northbrook region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 38 listings have been posted online, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the office spaces in the Northbrook are subleases, so you will probably have to consider a longer term lease. 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 1,610 sqft. Most properties in this region are around 4 stories. Most buildings in this area were built in 1980 and are Class A.