The demolition of part of an east London terrace is due to get underway today after cracks in the building were spotted over the weekend.
Officials are hoping to save four flats and a restaurant in another section of the structure, but one other restaurant and three flats will be knocked down first.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants