Most listings are in the $10's per square foot per year. The Charleston submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 8 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,440 sqft. Most properties in this region are approximately 5 stories. Most buildings in this area were built in 1984 and are Class B.