Most listings are in the $20's per square foot per year. The Hillsboro region is experiencing a decrease in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 14% decrease in rent.
Compared to the rest of the Greater Portland market, the Hillsboro submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 30 listings have come on the market, which means spaces might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 10% of the available leases in the Hillsboro are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,300 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 1999 and are Class A.