Most listings are in the $20's per square foot per year. The Mount Pleasant 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% decrease in rent.
In the last 90 days, 7 listings have been listed, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 14% of the office spaces in the Mount Pleasant are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,260 sqft. Most properties in this market are close to 2 floors. Most buildings in this area were built in 2002 and are Class A.