The typical asking rate per listing is in the $30's per square foot per year. The Clackamas County region is going through a decrease in rates. In the last 3 months, the median rate decreased $6 per sqft per year. That's a 16% decrease in rent.
In the last 90 days, 29 listings have been posted online, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 3% of the office spaces in the Clackamas County 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 2,080 sqft. Most buildings in this area are close to 3 floors. Most buildings in this region were built in 1991 and are Class A.