On average, listings lease in the $20's per square foot per year. The Yelm submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $24 per sqft per year.
In the last 90 days, 2 listings have been listed, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. 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 900 sqft. Most buildings in this region are around 1 floors. Most buildings in this area were built in 2011 and are Class C.