Most listings are in the $10's per square foot per year. The Oregon City region is seeing a decline in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 25% decrease in rent.
Compared to the rest of the Greater Portland market, the Oregon City submarket has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 3 listings have been posted online, which means listings might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 properties in this area are around 1 stories. Most buildings in this area were built in 1991 and are Class B.