The typical asking rate per listing is in the $20's per square foot per year. The SeaTac submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 13% decrease in rent.
Compared to the rest of the Seattle Metropolitan Area market, the SeaTac submarket has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 5 listings have come on the market, which means new listings 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 posted, so finding a space for a small business might be tough.
Even though the median size is 3,420 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this market are around 3 stories. Most buildings in this market were built in 1979 and are Class B.