The typical asking rate per listing is in the $20's per square foot per year. The Spartanburg region is going through a a rise in rates. In the last 3 months, the median rate went up $22 per sqft per year.
In the last 90 days, 33 listings have been listed, which means new availabilities most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 200% of the office spaces in the Spartanburg 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 1,800 sqft. Most buildings in this market are around 2 floors. Most buildings in this market were built in 1972 and are Class A.