On average, listings lease in the $20's per square foot per year. The Charleston submarket is going through a decrease in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 17% decrease in rent.
In the last 90 days, 133 listings have been made available, so you'll want to check back regularly for new listings. About 2% of the available space in the Charleston are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 2,670 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this market are around 2 stories. Most buildings in this market were built in 1986 and are Class A.