The typical asking rate per listing is in the $30's per square foot per year. The Washington D.C. submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 2% decrease in rent.
In the last 90 days, 1821 listings have been listed, 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 sign a longer term lease with the landlord directly. 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 3,460 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this market are around 5 stories. Most buildings in this area were built in 1986 and are Class A.