On average, listings lease in the $50's per square foot per year. The Corte Madera region is going through a an increase in rates. In the last 3 months, the median rate went up $56 per sqft per year.
Compared to the rest of the Bay Area market, the Corte Madera submarket has higher rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 4 listings have been listed, which means spaces most likley are 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 1,650 sqft. Most properties in this region are approximately 2 stories. Most buildings in this region were built in 1980 and are Class A.