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In that scenario, the deck’s collapse would have left these 16-inch-thick columns “unbraced” for about 24 feet, from the floor of the parking garage up to the ceiling of the first floor.

One prior case with possible legal parallels involves the 2013 collapse in Philadelphia of an unbraced wall of a building that was being demolished.

The arches are unbraced, meaning they aren’t tied together by lateral connections, leaving the view to the sky open.

Five years ago, six people were killed and 13 injured when a towering brick wall left unbraced during a demolition project crushed an adjacent Salvation Army store in the city.

Six people were killed and 13 injured when a towering brick wall left unbraced during a demolition project crushed an adjacent Salvation Army store in 2013.