Most listings are in the $10's per square foot per year. The Pompton Lakes region is going through a an increase in rates. In the last 3 months, the median rate rose $16 per sqft per year.
In the last 90 days, 1 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 800 sqft. Most buildings in this market were built in 1952 and are Class B.