The typical asking rate per listing is in the $10's per square foot per year. The Hanahan submarket is going through a a rise in rates. In the last 3 months, the median rate went up $18 per sqft per year.
In the last 90 days, 4 listings have been listed, which means office spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 4,270 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this area were built in 1980 and are Class B.