That picture is from a site where one panel of the slab has been removed. The right-to-left brown strip is a steel beam exposed by the slab removal; the gray above the brown is the next panel of slab over, intact; and the gray below is a dirty piece of plywood that kept the demo debris from falling to the next floor below. Original tie rods are visible on the left, rather loose, as they often are.
That is some very, very neat demolition work.
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