On average, listings lease in the $40's per square foot per year. The Foster City region is experiencing a decline in rates. In the last 3 months, the median rate decreased $32 per sqft per year. That's a 42% decline in rent.
Compared to the rest of the Silicon Valley market, the Foster City submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 6 listings have been made available, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 33% of the listings in the Foster City are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,030 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this area are around 4 stories. Most buildings in this area were built in 1988 and are Class A.