The typical asking rate per listing is in the $10's per square foot per year. The Post Falls submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $16 per sqft per year.
In the last 90 days, 5 listings have been listed, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 520% of the listings in the Post Falls are subleases, so you might be able to find a shorter term or below market rent. 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 around 1 floors. Most buildings in this region were built in 1985 and are Class B.