Forty of the 50 conceptual street signs, featuring skulls and coat hangers, have been swiped.
The towering skyscraper's beacon and spire was lit up Friday night.
The last pieces of the WTC spire were hoisted to the roof Thursday morning.
The first section of the WTC spire was hoisted atop the building Wednesday morning.
Sections of the WTC spire arrived at Pier 25 Tuesday morning via barge.
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