On average, listings lease in the $30's per square foot per year. The Newark submarket is seeing a an increase in rates. In the last 3 months, the median rate rose $15 per sqft per year. That's a 73% 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, 23 listings have come on the market, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 4% of the available leases in the Newark 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,900 sqft. Most buildings in this area are around 1 floors. Most buildings in this region were built in 1996 and are Class A.