Most listings are in the $30's per square foot per year. The Newark submarket is going through a an increase in rates. In the last 3 months, the median rate increased $6 per sqft per year. That's a 21% rise in rent.
Compared to the rest of the East Bay market, the Newark submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 18 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,600 sqft. Most buildings in this area are approximately 1 floors. Most buildings in this area were built in 1996 and are Class A.