Most listings are in the $20's per square foot per year. The Dearborn region is going through a an increase in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 18% rise in rent.
Compared to the rest of the Metro Detroit market, the Dearborn region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 51 listings have come on the market, so you'll want to check back regularly for new listings. About 4% of the listings in the Dearborn are subleases, so you will probably have to consider a longer term lease. 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 1,100 sqft. Most buildings in this market are approximately 1 stories. Most buildings in this area were built in 1982 and are Class Class B.