On average, listings lease in the $10's per square foot per year. The Columbia region is going through a decrease in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 10% decrease in rent.
In the last 90 days, 30 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 7% of the office spaces in the Columbia 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 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 1,600 sqft. Most properties in this market are close to 2 floors. Most buildings in this area were built in 1997 and are Class A.