The typical asking rate per listing is in the $0's per square foot per year. The Dover submarket is experiencing a decrease in rates. In the last 3 months, the median rate fell $18 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 4 listings have been made available, which means leases most likley are 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most buildings in this market are around 2 floors. Most buildings in this area were built in 1968 and are Class C.