The typical asking rate per listing is in the $20's per square foot per year. The South Jersey region is going through a a rise in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 6% rise in rent.
In the last 90 days, 401 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the available space in the South Jersey are subleases, so you will probably have to focus your search on direct office leases. 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 2,500 sqft. Most buildings in this region are around 2 stories. Most buildings in this area were built in 1986 and are Class A.