Most listings are in the $70's per square foot per year. The Foster City submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $11 per sqft per year. That's a 16% rise in rent.
Compared to the rest of the Silicon Valley market, the Foster City submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 12 listings have been made available, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 8% of the listings in the Foster City are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 5,750 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this region are approximately 4 stories. Most buildings in this region were built in 1985 and are Class A.