The typical asking rate per listing is in the $0's per square foot per year. The Clemson region is going through a decrease in rates. In the last 3 months, the median rate decreased $17 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 2 listings have been listed, which means new availabilities 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most properties in this area are around 2 floors. Most buildings in this region were built in 1993 and are Class B.