The typical asking rate per listing is in the $70's per square foot per year. The Larkspur region is going through a a boost in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 6% increase in rent.
Compared to the rest of the Bay Area market, the Larkspur region has higher rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 6 listings have come on the market, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 33% of the office spaces in the Larkspur are subleases, so you might be able to snag a great spot on a short term. 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 1,980 sqft. Most properties in this area are around 2 stories. Most buildings in this region were built in 1980 and are Class B.