Compared to the rest of the Seattle Metropolitan Area market, the Mercer Island region has greater rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 1 listings have come on the market, which means listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 980 sqft. Most buildings in this area are around 2 stories. Most buildings in this area were built in 1982 and are Class B.