Most listings are in the $10's per square foot per year. The Gresham region is going through a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 11% decline in rent.
Compared to the rest of the Greater Portland market, the Gresham submarket has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 12 listings have been made available, which means listings might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,330 sqft. Most properties in this market are approximately 2 stories. Most buildings in this area were built in 1998 and are Class C.