Lisa - I don't work in DC, so I can't really answer your question. But, I'd like to refer you to a site where you can run a list of the homes currently available and recently sold in your neighborhood. You'll be able to determine which homes are most like yours and therefore determine and approximation of the current value of your home. It will work in DC, despite the name of the web site. I hope it helps you.
(Be sure and put in your REAL address and email - otherwise you'll get bad results or none at all. The report will automatically generate and takes about 1-3 minutes to arrive in your email.)