The typical asking rate per listing is in the $30's per square foot per year. The Washington D.C. region is going through a a boost in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 1195 listings have been made available, so you'll want to check back regularly for new listings. About 145% of the listings in the Washington D.C. 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 2,870 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this area are around 4 stories. Most buildings in this region were built in 1986 and are Class A.