On average, listings lease in the $20's per square foot per year. The Marathon County region is experiencing a a boost in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 12 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the available space in the Marathon County are subleases, so you might be able to find a shorter term or below market rent. 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 2,330 sqft. Most properties in this area are around 1 stories. Most buildings in this area were built in 1990 and are Class B.