Compared to the rest of the East Bay market, the Hayward submarket has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 15 listings have been made available, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 13% of the listings 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,300 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this area were built in 1978 and are Class A.