The typical asking rate per listing is in the $10's per square foot per year. The Sumner region is experiencing a an increase in rates. In the last 3 months, the median rate rose $15 per sqft per year.
Compared to the rest of the Seattle Metropolitan Area market, the Sumner region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 2 listings have been made available, which means new listings might be 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.
Even though the median size is 4,000 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this market are around 2 floors. Most buildings in this market were built in 1979 and are Class B.