Most listings are in the $10's per square foot per year. The Port Huron region is going through a a boost in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 36% rise in rent.
Compared to the rest of the Metro Detroit market, the Port Huron submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 15 listings have been posted online, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, 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 buildings in this region are approximately 1 floors. Most buildings in this region were built in 1963 and are Class Class B.