Most listings are in the $10's per square foot per year. The Montana submarket is going through a an increase in rates. In the last 3 months, the median rate rose $17 per sqft per year.
In the last 90 days, 229 listings have been made available, so you'll want to check back regularly for new listings. About 40% of the available space in the Montana are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,400 sqft. Most buildings in this market are close to 2 floors. Most buildings in this region were built in 1982 and are Class C.