On average, listings lease in the $20's per square foot per year. The Plainfield region is going through a a boost in rates. In the last 3 months, the median rate went up $23 per sqft per year.
In the last 90 days, 6 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 35,000 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this area are approximately 1 stories. Most buildings in this market were built in 0 and are Class Class B.