The typical asking rate per listing is in the $30's per square foot per year. The Bernardsville submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $32 per sqft per year.
In the last 90 days, 4 listings have been listed, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,800 sqft. Most properties in this area are approximately 2 stories. Most buildings in this market were built in 1910 and are Class A.