The typical asking rate per listing is in the $10's per square foot per year. The Ukiah submarket is going through a a boost in rates. In the last 3 months, the median rate rose $19 per sqft per year.
In the last 90 days, 1 listings have been made available, which means leases might be going fast. You'll want to be prepared to tour spaces as quick as possible. 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 1,550 sqft. Most properties in this area are close to 1 floors.