In the 20th century, squatters turned to abandoned, sometimes derelict, buildings. Mass squats were organised in a number of prominent public buildings in Central London, culminating in the occupation of the Queen Mother's ex-residence at 144 Piccadilly in 1969. This London Street Commune or "Hippydilly" garnered worldwide attention and the media created what one of the leaders later described as a moral panic. There were estimated to be 50,000 squatters throughout Britain in the late 1970s, with the majority (30,000) living in London. The BBC reported in 2011 that the government estimated that there were "20,000 squatters in the UK" and "650,000 empty properties". Until that point, squatting was not in and of itself a criminal offence.