Most listings are in the $30's per square foot per year. The El Paso de Robles submarket is seeing a a rise in rates. In the last 3 months, the median rate increased $10 per sqft per year. That's a 38% rise in rent.
In the last 90 days, 14 listings have been made available, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 7% of the office spaces in the El Paso de Robles are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 600 sqft. Most properties in this region are around 3 stories.