The typical asking rate per listing is in the $10's per square foot per year. The Duncan region is going through a a rise in rates. In the last 3 months, the median rate increased $18 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. About 1,900% of the available space in the Duncan are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 290 sqft. Most properties in this region are approximately 2 floors. Most buildings in this region were built in 1978 and are Class C.