On average, listings lease in the $10's per square foot per year. The Sedona region is going through a an increase in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 2% increase in rent.
In the last 90 days, 6 listings have been listed, 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 850 sqft. Most properties in this area are approximately 2 stories. Most buildings in this region were built in 2004 and are Class B.