Most listings are in the $20's per square foot per year. The Summerville region is experiencing a a boost in rates. In the last 3 months, the median rate rose $6 per sqft per year. That's a 38% rise in rent.
In the last 90 days, 8 listings have been listed, which means spaces 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,890 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this region were built in 1989 and are Class B.