The typical asking rate per listing is in the $10's per square foot per year. The Port Huron submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 36% increase in rent.
Compared to the rest of the Metro Detroit market, the Port Huron region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 11 listings have been made available, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most properties in this market are around 1 floors. Most buildings in this area were built in 1963 and are Class Class B.