The typical asking rate per listing is in the $20's per square foot per year. The Oregon region is experiencing a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% increase in rent.
In the last 90 days, 454 listings have come on the market, so you'll want to check back regularly for new listings. About 5% of the available leases in the Oregon are subleases, so you will probably have to consider a longer term lease. 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 2,200 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this region were built in 1985 and are Class A.