The typical asking rate per listing is in the $10's per square foot per year. The Oshkosh region is seeing a an increase in rates. In the last 3 months, the median rate went up $15 per sqft per year.
In the last 90 days, 2 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 50% of the office spaces in the Oshkosh 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 7,900 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this market are around 2 floors. Most buildings in this region were built in 0 and are Class B.