Compared to the rest of the Greater Portland market, the Oregon City region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 3 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 500 sqft. Most buildings in this area are approximately 1 stories. Most buildings in this market were built in 1991 and are Class B.