Most listings are in the $10's per square foot per year. The Eau Claire region is experiencing a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 20% increase in rent.
In the last 90 days, 9 listings have been listed, which means 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,600 sqft. Most properties in this area are around 3 stories. Most buildings in this region were built in 1978 and are Class A.