“The external walls, ceilings and floors were painted with a black graphite semi-conducting paint, according to a section of the apartment’s website that extensively details the process. Additionally, the floor, walls and ceilings are connected in a network of wire strips. Even the windows got a coat of electromagnetic field (EMF) blocking polymer.”
Pretty fascinating stuff as the owners took an apartment located in a neighborhood with 600 times the federal safety standard for EMF and after making the improvements showed a level below federal standards. You can read the rest of the story here.