Most listings are in the $10's per square foot per year. The Newark submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 29% decline in rent.
In the last 90 days, 2 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 50% of the available space in the Newark 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,250 sqft. Most buildings in this region are close to 1 floors. Most buildings in this region were built in 1990 and are Class B.