On average, listings lease in the $10's per square foot per year. The Ann Arbor region is experiencing a decrease in rates. In the last 3 months, the median rate fell $11 per sqft per year. That's a 36% decline in rent.
In the last 90 days, 77 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available space in the Ann Arbor are subleases, so you will probably have to consider a longer term lease. 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 1,700 sqft. Most buildings in this region are close to 2 stories. Most buildings in this area were built in 1964 and are Class Class B.