On average, listings lease in the $20's per square foot per year. The Franklin Lakes region is going through a a rise in rates. In the last 3 months, the median rate rose $26 per sqft per year.
In the last 90 days, 0 listings have been posted online, which means new availabilities might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the listings in the Franklin Lakes are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,200 sqft. Most buildings in this market were built in 1983 and are Class A.