On average, listings lease in the $20's per square foot per year. The Mountlake Terrace submarket is seeing a a boost in rates. In the last 3 months, the median rate increased $29 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the Seattle Metropolitan Area market, the Mountlake Terrace region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 4 listings have been listed, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 2,550 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this market are close to 3 floors. Most buildings in this area were built in 1989 and are Class A.