On average, listings lease in the $10's per square foot per year. The Mendocino region is experiencing a a boost in rates. In the last 3 months, the median rate rose $19 per sqft per year.
In the last 90 days, 3 listings have been posted online, which means new availabilities 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 1,550 sqft. Most buildings in this region are close to 1 floors. Most buildings in this area were built in 1988.