Most listings are in the $0's per square foot per year. The Bernardsville region is seeing a decline in rates. In the last 3 months, the median rate fell $32 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 0 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the available leases in the Bernardsville are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1910 and are Class A.