Most listings are in the $20's per square foot per year. The River West region is experiencing a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% rise in rent.
In the last 90 days, 6 listings have been posted online, which means 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,810 sqft. Most buildings in this market are around 2 floors. Most buildings in this region were built in 1989 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Utilities is the dominant industry in this area. Most of the folk of River West work from home. Commuting around 30 minutes a day is the norm for those who opt to reside in this part of town.