On average, listings lease in the $30's per square foot per year. The Lucas Valley-Marinwood submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $36 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the Bay Area market, the Lucas Valley-Marinwood region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 9 listings have been made available, which means new availabilities most likley are 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 posted, 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 market were built in 1980 and are Class A.