The typical asking rate per listing is in the $10's per square foot per year. The Dearborn region is going through a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 25% decline 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 depreciated region.
In the last 90 days, 19 listings have been posted online, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 5% of the office spaces 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 2,110 sqft. Most properties in this area are approximately 1 floors. Most buildings in this region were built in 1983 and are Class Class B.