The typical asking rate per listing is in the $20's per square foot per year. The River West region is going through a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 4% rise in rent.
In the last 90 days, 13 listings have come on the market, which means office spaces might be going fast. 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 1,560 sqft. Most buildings in this market are close to 2 stories. 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 close to 30 minutes a day is the norm for those who opt to reside in this part of town.