The typical asking rate per listing is in the $10's per square foot per year. The Sussex County region is going through a a boost in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 4% increase in rent.
In the last 90 days, 29 listings have been listed, which means spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 2,500 sqft. Most properties in this region are close to 2 floors. Most buildings in this area were built in 2007 and are Class A.