On average, listings lease in the $20's per square foot per year. The Bellingham region is going through a a boost in rates. In the last 3 months, the median rate increased $4 per sqft per year. That's a 20% rise in rent.
In the last 90 days, 25 listings have been posted online, which means new availabilities most likley are going fast. 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.
The standard measurement for office space in this area is around 1,310 sqft. Most buildings in this market are close to 2 floors. Most buildings in this area were built in 1985 and are Class B.