On average, listings lease in the $10's per square foot per year. The Somerset County submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $16 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 3 listings have come on the market, which means new listings 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,500 sqft. Most buildings in this region were built in 1970 and are Class A.