The order was implemented in accordance with the 1992 royal decree on land expropriation that allows the BMA to turn Mahakan Fort into a canal-front historical park.
In 2004, the Supreme Administrative Court ruled the BMA could demolish the community structures.
The BMA advised residents they could ask the Phra Nakhon District Office for help moving out.
Residents were told the BMA and the National Housing Authority would open a booth at Mahajetsadabodin Plaza on April 19 to find them new homes.