Most listings are in the $10's per square foot per year. The Mount Pleasant submarket is going through a a rise in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 17% rise in rent.
In the last 90 days, 4 listings have been posted online, which means new availabilities might be 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,160 sqft. Most buildings in this market are around 1 stories. Most buildings in this market were built in 1978 and are Class C.