The typical asking rate per listing is in the $30's per square foot per year. The West Linn submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $39 per sqft per year. That's a 50% decline in rent.
Compared to the rest of the Greater Portland market, the West Linn region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 3 listings have come on the market, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,350 sqft. Most buildings in this market were built in 2006 and are Class A.