Compared to the rest of the East Bay market, the Castro Valley submarket has higher rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 0 listings have come on the market, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the available leases in the Castro Valley are subleases, so you might be able to snag a great spot on a short term. 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 1,400 sqft. Most properties in this area are close to 1 stories. Most buildings in this area were built in 1982.