On average, listings lease in the $10's per square foot per year. The Ukiah region is experiencing a a rise in rates. In the last 3 months, the median rate increased $17 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 4 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 740 sqft. Most properties in this market are close to 1 stories.