Compared to the rest of the Greater Portland market, the West Linn submarket has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 3 listings have been posted online, which means office spaces most likley are 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 750 sqft. Most buildings in this market were built in 2006 and are Class A.