In the last 90 days, 6 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 17% of the listings in the Bellevue are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,390 sqft. Most buildings in this market are around 3 stories. Most buildings in this market were built in 2008 and are Class A.