On average, listings lease in the $10's per square foot per year. The Missoula submarket is going through a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 9% decline in rent.
In the last 90 days, 62 listings have been posted online, so you'll want to check back regularly for new listings. 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 1,700 sqft. Most properties in this region are approximately 2 floors. Most buildings in this market were built in 1981 and are Class A.