The typical asking rate per listing is in the $10's per square foot per year. The Bozeman region is going through a an increase in rates. In the last 3 months, the median rate rose $0 per sqft per year. That's a 2% rise in rent.
In the last 90 days, 24 listings have come on the market, which means new listings 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 1,890 sqft. Most properties in this region are approximately 2 stories. Most buildings in this region were built in 1997 and are Class A.