If riding the metro is important to you for commuting to work, I’d strongly urge you to look at my Metrorail Search. This conveniently finds homes within a certain radius near a metro stop. From here you can also click on the tabs for the Virginia Railway Express (VRE) and Maryland Area Regional Commuter (MARC). Main State is located near Foggy Bottom (on the Orange or Blue Line). The Commerce Building is located near Federal Triangle (on the Blue or Orange Line). WMATA (Washington Metro Area Transit Authority) also offers an array of buses. You can see their Trip Planner here.
Contact me for a quick questionnaire so I can understand your commuting needs!