On average, listings lease in the $10's per square foot per year. The Bellevue region is experiencing a a rise in rates. In the last 3 months, the median rate rose $19 per sqft per year.
In the last 90 days, 38 listings have come on the market, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 13% of the listings in the Bellevue 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 available, so finding a space for a small business might be tough.
Even though the median size is 54,000 sqft, there are still 0 leases below 2,000 sqft. Most properties in this region are close to 1 floors. Most buildings in this area were built in 1988 and are Class C.