In the last 90 days, 33 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 27% of the available leases 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 300 sqft. Most buildings in this market are around 1 stories. Most buildings in this market were built in 1979 and are Class C.