On average, listings lease in the $20's per square foot per year. The Rock Springs region is going through a an increase in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 9 listings have been made available, which means listings are probably going fast. 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 920 sqft. Most properties in this area are close to 1 stories. Most buildings in this market were built in 1985.