Most listings are in the $10's per square foot per year. The Dorchester County region is going through a a rise in rates. In the last 3 months, the median rate went up $18 per sqft per year.
In the last 90 days, 15 listings have been made available, which means spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 20% of the listings in the Dorchester County are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 properties in this market are around 2 stories. Most buildings in this region were built in 1989 and are Class B.