Most listings are in the $10's per square foot per year. The Summerville submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $6 per sqft per year. That's a 27% decrease in rent.
In the last 90 days, 2 listings have been posted online, which means spaces most likley are 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 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 1,100 sqft. Most properties in this area are approximately 2 stories. Most buildings in this market were built in 1989 and are Class B.