9/11 Bill Bratton said all the buildings in the area had to checked because of the phenomenal series of explosions.. Some building are still cracked today i.e the federal reserve building,,,
i.e
The $16 million rehabilitation can be traced directly to the attack on New York.
"We have severe cracks in the infrastructure, which had existed prior to 9/11, but 9/11 exacerbated the cracking" of interior and exterior walls, said Joseph T. Avery, superintendent of Manhattan sites for the National Park Service, which runs Federal Hall. One of those fissures, in a basement storage room, had grown ominously in the wake of the attack. "What had been a pinhole was big enough that you could put your thumb in," Mr. Avery recalled.
The park service called in the architectural and engineering firm Einhorn Yaffee Prescott. One of the attention-grabbing exterior cracks was at the corner near Pine Street. Formerly a hairline, it was now closer to a quarter-inch wide.
"It seems to have been the seismic event of the collapses that triggered the cracking," said Marie Ennis, an engineer and the firm's principal in charge of the project.
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