The typical asking rate per listing is in the $70's per square foot per year. The Larkspur region is experiencing a a rise in rates. In the last 3 months, the median rate rose $75 per sqft per year.
Compared to the rest of the Bay Area market, the Larkspur 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, 6 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 183% of the available leases 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 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 2,290 sqft. Most buildings in this region are approximately 2 floors. Most buildings in this market were built in 1980 and are Class B.