On average, listings lease in the $20's per square foot per year. The Hayward submarket is seeing a a boost 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 undervalued region.
In the last 90 days, 12 listings have come on the market, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 17% of the office spaces in the Hayward 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 available, 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 region are approximately 1 floors. Most buildings in this area were built in 1981 and are Class A.