Most listings are in the $10's per square foot per year. The Lake Geneva region is going through a a boost in rates. In the last 3 months, the median rate went up $18 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 2 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 50% of the listings in the Lake Geneva are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 5,400 sqft, there are still 0 new listings below 2,000 sqft.