On average, listings lease in the $40's per square foot per year. The Calvert County submarket is going through a a boost in rates. In the last 3 months, the median rate went up $14 per sqft per year. That's a 46% rise in rent.
In the last 90 days, 2 listings have come on the market, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,660 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1999 and are Class A.