Most listings are in the $20's per square foot per year. The Greenbelt submarket is seeing a a rise in rates. In the last 3 months, the median rate increased $7 per sqft per year. That's a 37% increase in rent.
Compared to the rest of the Washington D.C. market, the Greenbelt region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 30 listings have been posted online, which means new listings 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,133 sqft. Most buildings in this market are approximately 8 floors. Most buildings in this area were built in 1984 and are Class A.