Most listings are in the $20's per square foot per year. The Madison region is seeing a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 8% decline in rent.
In the last 90 days, 25 listings have been posted online, which means office spaces might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 4% of the available leases in the Madison are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,940 sqft. Most properties in this region are approximately 1 stories. Most buildings in this area were built in 2005 and are Class B.