Most listings are in the $20's per square foot per year. The Rock Springs region is seeing a an increase in rates. In the last 3 months, the median rate went up $21 per sqft per year.
In the last 90 days, 9 listings have been listed, which means spaces most likley are leasing quickly. 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 920 sqft. Most properties in this market are close to 1 floors. Most buildings in this area were built in 1985.