On average, listings lease in the $30's per square foot per year. The Seattle region is going through a a boost in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 6% increase in rent.
In the last 90 days, 368 listings have been made available, so you'll want to check back regularly for new listings. About 12% of the office spaces in the Seattle 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.
Even though the median size is 3,200 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this region are close to 3 stories. Most buildings in this market were built in 1982 and are Class A.