Most listings are in the $20's per square foot per year. The Edgewood submarket is experiencing a an increase 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 smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 2 listings have been listed, which means leases might be going fast. You'll want to be prepared to make an offer immediately. 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.