Most listings are in the $20's per square foot per year. The St. Mary's County region is seeing a decrease in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 9% decline in rent.
In the last 90 days, 8 listings have been made available, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 13% of the available leases in the St. Mary's County are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,000 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this market are close to 1 floors. Most buildings in this region were built in 2000 and are Class A.