Most listings are in the $10's per square foot per year. The Bellevue region is seeing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 6% decrease in rent.
In the last 90 days, 38 listings have come on the market, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 13% of the available space 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 posted, so finding a space for a small business might be tough.
Even though the median size is 54,000 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this area are around 1 floors. Most buildings in this region were built in 1986 and are Class C.