The typical asking rate per listing is in the $20's per square foot per year. The Kenmore region is seeing a a rise 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 Kenmore region has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 1 listings have been listed, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 100% of the available leases in the Kenmore are subleases, so you might be able to snag a great spot on a short term. 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 870 sqft. Most buildings in this region were built in 1950 and are Class A.