The typical asking rate per listing is in the $20's per square foot per year. The Charleston region is seeing a decrease in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 17% decline in rent.
In the last 90 days, 133 listings have been posted online, so you'll want to check back regularly for new listings. About 2% of the listings in the Charleston are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 2,680 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are approximately 2 stories. Most buildings in this market were built in 1986 and are Class A.