Most listings are in the $20's per square foot per year. The Harford County submarket is going through a an increase in rates. In the last 3 months, the median rate rose $21 per sqft per year.
Compared to the rest of the Greater Baltimore market, the Harford County submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 16 listings have been listed, which means leases 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 2,110 sqft. Most properties in this area are approximately 2 stories. Most buildings in this market were built in 2001 and are Class A.