On average, listings lease in the $20's per square foot per year. The Edgewood region is seeing a an increase in rates. In the last 3 months, the median rate went up $21 per sqft per year.
Compared to the rest of the Seattle Metropolitan Area market, the Edgewood region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 2 listings have been posted online, which means new listings most likley are 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 300 sqft.