The typical asking rate per listing is in the $40's per square foot per year. The Tamalpais-Homestead Valley region is seeing a an increase in rates. In the last 3 months, the median rate went up $50 per sqft per year.
Compared to the rest of the Bay Area market, the Tamalpais-Homestead Valley submarket has more expensive rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 1 listings have come on the market, which means spaces are probably 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 670 sqft. Most buildings in this area were built in 1957.