Most listings are in the $10's per square foot per year. The Beaverton submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $19 per sqft per year.
Compared to the rest of the Greater Portland market, the Beaverton submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 65 listings have been listed, so you'll want to check back regularly for new listings. About 34% of the available leases in the Beaverton 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 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 2,120 sqft. Most buildings in this region are close to 1 floors. Most buildings in this market were built in 1986 and are Class A.