On average, listings lease in the $30's per square foot per year. The Vancouver submarket is going through a a boost in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 14% rise in rent.
Compared to the rest of the Greater Portland market, the Vancouver region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 68 listings have been made available, so you'll want to check back regularly for new listings. About 3% of the listings in the Vancouver 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 2,490 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this market were built in 1993 and are Class A.