Most listings are in the $10's per square foot per year. The Summerville region is seeing a a rise in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 17% increase in rent.
In the last 90 days, 11 listings have been made available, which means listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 18% of the available leases in the Summerville are subleases, so you might be able to find a shorter term or below market rent. 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 2,180 sqft. Most properties in this area are approximately 2 floors. Most buildings in this market were built in 1996 and are Class A.