Most listings are in the $10's per square foot per year. The Humboldt region is seeing a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 8% increase in rent.
In the last 90 days, 14 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,250 sqft. Most buildings in this market are close to 2 stories. Most buildings in this region were built in 1965.