The typical asking rate per listing is in the $20's per square foot per year. The Oregon region is experiencing a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 10% increase in rent.
In the last 90 days, 424 listings have come on the market, so you'll want to check back regularly for new listings. About 5% of the available space in the Oregon are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,960 sqft. Most properties in this area are around 2 floors. Most buildings in this area were built in 1985 and are Class A.