On average, listings lease in the $30's per square foot per year. The Napa submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $18 per sqft per year. That's a 32% decline in rent.
Compared to the rest of the Bay Area market, the Napa submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 22 listings have come on the market, which means spaces might be 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 1,400 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this region were built in 1980 and are Class B.