On average, listings lease in the $20's per square foot per year. The Auburn region is going through a an increase in rates. In the last 3 months, the median rate went up $9 per sqft per year. That's a 47% rise in rent.
Compared to the rest of the Seattle Metropolitan Area market, the Auburn submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 8 listings have been listed, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 75% of the listings in the Auburn are subleases, so you might be able to snag a great spot on a short term. 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 2,500 sqft. Most properties in this region are around 1 stories. Most buildings in this market were built in 1989 and are Class B.