The typical asking rate per listing is in the $30's per square foot per year. The Novato submarket is seeing a decline in rates. In the last 3 months, the median rate fell $9 per sqft per year. That's a 22% decrease in rent.
Compared to the rest of the Bay Area market, the Novato submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 38 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 8% of the available space in the Novato are subleases, so you will probably have to consider a longer term lease. 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 2,240 sqft. Most properties in this area are around 2 stories. Most buildings in this area were built in 1987 and are Class B.