Compared to the rest of the Greater Portland market, the Wilsonville submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 2 listings have been posted online, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 450% of the available space in the Wilsonville are subleases, so you might be able to find a shorter term or below market rent. 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 390 sqft. Most buildings in this market are close to 1 floors. Most buildings in this area were built in 1980 and are Class B.