The typical asking rate per listing is in the $10's per square foot per year. The Montana submarket is going through a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 6% rise in rent.
In the last 90 days, 229 listings have been listed, so you'll want to check back regularly for new listings. About 0% of the available leases in the Montana are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,900 sqft. Most buildings in this area are close to 2 floors. Most buildings in this area were built in 1984 and are Class A.