The typical asking rate per listing is in the $20's per square foot per year. The Boise City region is going through a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 201 listings have been listed, so you'll want to check back regularly for new listings. About 2% of the office spaces in the Boise City are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,130 sqft. Most buildings in this market are around 1 stories. Most buildings in this market were built in 1990 and are Class A.