According to the statistics provided by MRIS, the Metropolitan Regional Information Service, average prices for homes actually sold in 22207 have dropped by 10.15 percent over the past year. Trends, however, are very different depending on the price range for the home. For instance, the market for homes priced over $1million is very different than for homes under $1million. Check out my website for 22207 and you'll find a price trend chart that I can break down by quartile for you if you'd like.
Hope that helps,