The typical asking rate per listing is in the $10's per square foot per year. The Wade Hampton region is going through a a boost in rates. In the last 3 months, the median rate rose $15 per sqft per year.
In the last 90 days, 5 listings have been made available, which means office spaces most likley are going fast. 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 1,660 sqft. Most buildings in this region are close to 2 floors. Most buildings in this market were built in 1989 and are Class B.