Most listings are in the $20's per square foot per year. The Oregon City region is experiencing a an increase 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 Oregon City region has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 1 listings have been listed, which means new availabilities are probably 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 1,650 sqft. Most properties in this region are around 1 floors. Most buildings in this area were built in 1991 and are Class B.