Compared to the rest of the Greater Portland market, the Milwaukie region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 5 listings have come on the market, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 120% of the listings in the Milwaukie are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,220 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1988 and are Class B.