The typical asking rate per listing is in the $30's per square foot per year. The Mount Pleasant submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 5% decline in rent.
In the last 90 days, 10 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 10% of the listings in the Mount Pleasant are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,260 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 2002 and are Class A.