On average, listings lease in the $10's per square foot per year. The Summerville region is going through a an increase in rates. In the last 3 months, the median rate went up $18 per sqft per year.
In the last 90 days, 10 listings have been listed, which means office spaces might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 20% of the available space in the Summerville are subleases, so you might be able to snag a great spot on a short term. 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 buildings in this market are close to 2 floors. Most buildings in this region were built in 1996 and are Class A.