On average, listings lease in the $30's per square foot per year. The Lucas Valley-Marinwood region is experiencing a a boost in rates. In the last 3 months, the median rate went up $36 per sqft per year.
Compared to the rest of the Bay Area market, the Lucas Valley-Marinwood submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 5 listings have been made available, which means new listings 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 200 sqft. Most buildings in this area were built in 1980 and are Class A.