Most listings are in the $20's per square foot per year. The New Castle County region is experiencing a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 10% decline in rent.
In the last 90 days, 181 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available leases in the New Castle County are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,370 sqft. Most properties in this area are close to 3 stories. Most buildings in this region were built in 1986 and are Class A.