On average, listings lease in the $10's per square foot per year. The Wayne County region is going through a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 12% decline in rent.
In the last 90 days, 29 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the office spaces in the Wayne County are subleases, so you will probably have to focus your search on direct office leases. 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 620 sqft. Most properties in this market are close to 2 stories. Most buildings in this market were built in 1985 and are Class B.