Compared to the rest of the Seattle Metropolitan Area market, the Burien submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 2 listings have been made available, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 50% of the office spaces in the Burien 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 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 1,280 sqft. Most buildings in this region are around 2 stories. Most buildings in this region were built in 1979 and are Class B.