Compared to the rest of the Seattle Metropolitan Area market, the Mercer Island region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 1 listings have been listed, which means spaces might be leasing quickly. 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 1,460 sqft. Most buildings in this area are close to 2 stories. Most buildings in this market were built in 1979 and are Class A.