The typical asking rate per listing is in the $20's per square foot per year. The Hayward region is experiencing a an increase in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 11% rise in rent.
Compared to the rest of the East Bay market, the Hayward region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 12 listings have been posted online, which means listings might be going fast. You'll want to be prepared to make an offer immediately. About 17% of the available leases in the Hayward are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,260 sqft. Most properties in this market are around 1 floors. Most buildings in this region were built in 1981 and are Class A.