On average, listings lease in the $20's per square foot per year. The Detroit region is experiencing a decline in rates. In the last 3 months, the median rate fell $7 per sqft per year. That's a 25% decrease in rent.
Compared to the rest of the Detroit market, the Detroit region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 105 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the available space in the Detroit 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.
Even though the median size is 5,000 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this market were built in 1939 and are Class B.