Most listings are in the $20's per square foot per year. The Rahway region is going through a an increase in rates. In the last 3 months, the median rate went up $28 per sqft per year.
In the last 90 days, 3 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 100% of the available space in the Rahway 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 posted, so finding a space for a small business might be tough.
Even though the median size is 11,110 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this area are approximately 2 floors. Most buildings in this area were built in 1952 and are Class B.