Most listings are in the $20's per square foot per year. The South Plainfield submarket is going through a a rise in rates. In the last 3 months, the median rate increased $24 per sqft per year.
In the last 90 days, 17 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 71% of the listings in the South Plainfield are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 8,810 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this region are approximately 2 floors. Most buildings in this area were built in 1986 and are Class B.