The typical asking rate per listing is in the $20's per square foot per year. The Edgewood submarket is going through a a boost in rates. In the last 3 months, the median rate increased $21 per sqft per year.
Compared to the rest of the Seattle Metropolitan Area market, the Edgewood region has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 2 listings have been listed, which means spaces might be 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 300 sqft.