Most listings are in the $20's per square foot per year. The Madison submarket is seeing a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 17% increase in rent.
In the last 90 days, 87 listings have been posted online, so you'll want to check back regularly for new listings. About 2% of the listings 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 1,880 sqft. Most properties in this area are approximately 2 floors. Most buildings in this area were built in 1987 and are Class B.