Most listings are in the $20's per square foot per year. The Hillsboro region is going through a an increase in rates. In the last 3 months, the median rate increased $22 per sqft per year.
Compared to the rest of the Greater Portland market, the Hillsboro region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 30 listings have been posted online, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 40% of the available space in the Hillsboro 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 6,550 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this area were built in 1999 and are Class A.