On average, listings lease in the $30's per square foot per year. The Lucas Valley-Marinwood submarket is going through a a boost in rates. In the last 3 months, the median rate went up $36 per sqft per year. That's a Inf% increase in rent.
Compared to the rest of the Bay Area market, the Lucas Valley-Marinwood region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 9 listings have been posted online, which means new availabilities are probably going fast. 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 470 sqft. Most buildings in this region were built in 1980 and are Class A.