Most listings are in the $10's per square foot per year. The Nixa submarket is going through a a rise in rates. In the last 3 months, the median rate rose $16 per sqft per year.
In the last 90 days, 12 listings have come on the market, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,780 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this market were built in 1992.