Most listings are in the $20's per square foot per year. The Wilmington region is going through a an increase in rates. In the last 3 months, the median rate rose $11 per sqft per year. That's a 58% increase in rent.
In the last 90 days, 72 listings have been made available, so you'll want to check back regularly for new listings. 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 1,940 sqft. Most buildings in this region are close to 4 stories. Most buildings in this area were built in 1970 and are Class A.