Most listings are in the $20's per square foot per year. The Monona region is going through a an increase in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 10 listings have been listed, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 80% of the available leases in the Monona 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.
The standard measurement for office space in this area is around 1,150 sqft. Most properties in this market are around 2 floors. Most buildings in this area were built in 1987 and are Class C.