The typical asking rate per listing is in the $20's per square foot per year. The Haddonfield region is experiencing a a rise in rates. In the last 3 months, the median rate rose $24 per sqft per year.
In the last 90 days, 1 listings have been made available, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 300% of the available leases in the Haddonfield are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,000 sqft. Most buildings in this area are around 2 floors. Most buildings in this area were built in 1896 and are Class C.