Most listings are in the $20's per square foot per year. The Marathon County submarket is seeing a an increase in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 12 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the available leases in the Marathon County are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, 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 market are close to 1 stories. Most buildings in this area were built in 1988 and are Class B.