The typical asking rate per listing is in the $30's per square foot per year. The Multnomah County submarket is seeing a an increase in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 9% rise in rent.
In the last 90 days, 259 listings have come on the market, so you'll want to check back regularly for new listings. About 7% of the available space in the Multnomah County are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,030 sqft. Most properties in this market are around 3 stories. Most buildings in this area were built in 1961 and are Class B.