On average, listings lease in the $20's per square foot per year. The Kootenai County submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $5 per sqft per year. That's a 30% rise in rent.
In the last 90 days, 35 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 6% of the available space in the Kootenai County are subleases, so you will probably have to consider a longer term 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 1,850 sqft. Most properties in this area are approximately 1 stories. Most buildings in this market were built in 1969 and are Class B.