Most listings are in the $30's per square foot per year. The Washington D.C. region is experiencing a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 2% increase in rent.
In the last 90 days, 1809 listings have been posted online, so you'll want to check back regularly for new listings. About 3% of the listings in the Washington D.C. are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 3,470 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are approximately 4 stories. Most buildings in this market were built in 1986 and are Class A.