The typical asking rate per listing is in the $20's per square foot per year. The Butte submarket is going through a an increase in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 11% increase in rent.
In the last 90 days, 5 listings have come on the market, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 20% of the office spaces in the Butte 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 available, so finding a space for a small business might be tough.
Even though the median size is 5,020 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this area are close to 1 stories. Most buildings in this region were built in 1979 and are Class A.