The typical asking rate per listing is in the $0's per square foot per year. The Duncan region is experiencing a decline in rates. In the last 3 months, the median rate decreased $22 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 3 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most properties in this market are around 2 floors.