Most listings are in the $40's per square foot per year. The Iselin region is going through a a boost in rates. In the last 3 months, the median rate went up $13 per sqft per year. That's a 40% rise in rent.
In the last 90 days, 26 listings have been posted online, which means leases might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 19% of the office spaces in the Iselin 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 7,600 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this area are around 5 stories. Most buildings in this region were built in 1986 and are Class A.