The dataset contains locations and attributes of historical or retired Parcel Lot polygons, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. These features are created when a property transaction occurs that changes the lot. Please visit http://vpm.dc.gov/ for additional information. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.