Most listings are in the $20's per square foot per year. The Beaverton region is going through a an increase in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% increase in rent.
Compared to the rest of the Greater Portland market, the Beaverton region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 65 listings have been listed, so you'll want to check back regularly for new listings. 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 1,810 sqft. Most properties in this area are approximately 1 floors. Most buildings in this area were built in 1987 and are Class A.