On average, listings lease in the $20's per square foot per year. The Milwaukie region is experiencing a a rise in rates. In the last 3 months, the median rate rose $26 per sqft per year.
Compared to the rest of the Greater Portland market, the Milwaukie submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 5 listings have come on the market, which means new availabilities are probably 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,010 sqft. Most properties in this market are close to 2 stories. Most buildings in this area were built in 1988 and are Class B.