Most listings are in the $10's per square foot per year. The Auburn submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $8 per sqft per year. That's a 33% decline in rent.
Compared to the rest of the Seattle Metropolitan Area market, the Auburn region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 4 listings have been posted online, which means new availabilities 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,880 sqft. Most properties in this area are approximately 2 floors. Most buildings in this market were built in 1989 and are Class B.