The typical asking rate per listing is in the $20's per square foot per year. The Somerset County submarket is going through a a boost in rates. In the last 3 months, the median rate rose $24 per sqft per year.
In the last 90 days, 4 listings have been listed, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. About 75% of the available space in the Somerset County 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 3,000 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area were built in 1970 and are Class A.