Most listings are in the $20's per square foot per year. The Tigard submarket is seeing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 5% decline in rent.
Compared to the rest of the Greater Portland market, the Tigard region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 58 listings have been listed, so you'll want to check back regularly for new listings. About 5% of the listings in the Tigard 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.
The standard measurement for office space in this area is around 1,980 sqft. Most buildings in this area are around 2 stories. Most buildings in this market were built in 1986 and are Class A.