On average, listings lease in the $50's per square foot per year. The Mill Valley submarket is going through a an increase in rates. In the last 3 months, the median rate increased $0 per sqft per year. That's a 1% rise in rent.
Compared to the rest of the Bay Area market, the Mill Valley region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 11 listings have been listed, which means new availabilities might be going fast. 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.
Even though the median size is 7,140 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this market were built in 1964 and are Class A.