The typical asking rate per listing is in the $10's per square foot per year. The Spokane region is seeing a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 15% decline in rent.
In the last 90 days, 83 listings have come on the market, so you'll want to check back regularly for new listings. 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 1,360 sqft. Most properties in this region are approximately 2 floors. Most buildings in this area were built in 1967 and are Class B.