Filed under: DC's Oldest House By Amy Rose Dobson Sep 28, 2012, 3:27pm EDT Said to be the oldest house in DC, Rosedale Farmhouse has gone under contract after being on the market for almost six months. The 4 bed, 4 bath is asking $4,950,000 after a $350K price cut. [Redfin] Rosedale Farmhouse 3501 NEWARK St NORTHWEST , WASHINGTON , DC 20016