On average, listings lease in the $10's per square foot per year. The Eau Claire region is going through a an increase in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 20% rise in rent.
In the last 90 days, 9 listings have been posted online, which means new listings 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 1,600 sqft. Most properties in this area are approximately 3 stories. Most buildings in this area were built in 1978 and are Class A.