On average, listings lease in the $0's per square foot per year. The Castro Valley submarket is going through a decline in rates. In the last 3 months, the median rate fell $32 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 0 listings have been posted online, which means listings might be going fast. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the available leases in the Castro Valley are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,110 sqft. Most buildings in this region are around 1 stories. Most buildings in this market were built in 1982.