On average, listings lease in the $10's per square foot per year. The Boise City 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 4% increase in rent.
In the last 90 days, 284 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the listings in the Boise City 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,620 sqft. Most buildings in this region are around 1 stories. Most buildings in this region were built in 1989 and are Class A.