Most listings are in the $30's per square foot per year. The Clackamas region is experiencing a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 5% rise in rent.
Compared to the rest of the Greater Portland market, the Clackamas submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 7 listings have been listed, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,280 sqft. Most properties in this market are around 2 floors. Most buildings in this market were built in 1998 and are Class A.