In the last 90 days, 62 listings have been made available, so you'll want to check back regularly for new listings. About 6% of the listings in the Charleston are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet posted, 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 area are approximately 2 stories. Most buildings in this region were built in 1985 and are Class A.