Compared to the rest of the Seattle Metropolitan Area market, the Tukwila region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 23 listings have been listed, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 113% of the listings in the Tukwila are subleases, so you might be able to find a shorter term or below market rent. 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 910 sqft. Most buildings in this area are close to 2 floors. Most buildings in this region were built in 1979 and are Class A.