The original boundaries that were established in 1800, along 9th and M Street SE, are still marked by a white brick wall that surrounds the Yard on the north and east sides. The following year, two additional lots were purchased. The north wall of the Yard was built in 1809 along with a guardhouse, now known as the Latrobe Gate. After the Burning of Washington in 1814, Tingey recommended that the height of the eastern wall be increased to ten feet (3 m) because of the fire and subsequent looting.