Most listings are in the $20's per square foot per year. The Hillsboro region is experiencing a decline in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 14% decline 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 depreciated region.
In the last 90 days, 32 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 9% of the listings in the Hillsboro are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 2,530 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this market are around 2 stories. Most buildings in this region were built in 1999 and are Class A.