The typical asking rate per listing is in the $70's per square foot per year. The Mount Pleasant region is going through a a boost in rates. In the last 3 months, the median rate rose $75 per sqft per year.
In the last 90 days, 35 listings have been made available, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 77% of the office spaces in the Mount Pleasant 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 200 sqft. Most properties in this market are close to 2 floors. Most buildings in this region were built in 2002 and are Class A.