The typical asking rate per listing is in the $50's per square foot per year. The Ross region is going through a a rise in rates. In the last 3 months, the median rate rose $9 per sqft per year. That's a 17% rise in rent.
Compared to the rest of the Bay Area market, the Ross submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 1 listings have been listed, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,090 sqft. Most buildings in this region were built in 1936 and are Class B.