Compared to the rest of the Bay Area market, the Larkspur region has higher rates, and you'll need to make a great offer to be in this hot submarket.
In the last 90 days, 6 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. About 100% of the listings in the Larkspur are subleases, so you might be able to find a shorter term or below market rent. 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 1,850 sqft. Most properties in this region are around 2 stories. Most buildings in this region were built in 1980 and are Class B.