The typical asking rate per listing is in the $10's per square foot per year. The Sussex County region is experiencing a an increase in rates. In the last 3 months, the median rate went up $20 per sqft per year.
In the last 90 days, 7 listings have been made available, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 314% of the listings in the Sussex County 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 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 1,750 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 2006 and are Class A.