Most listings are in the $50's per square foot per year. The Mill Valley region is experiencing a an increase in rates. In the last 3 months, the median rate rose $10 per sqft per year. That's a 23% increase in rent.
Compared to the rest of the Bay Area market, the Mill Valley region has greater rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 10 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 530 sqft. Most properties in this market are approximately 2 stories. Most buildings in this market were built in 1964 and are Class A.