Cantor Fitzgerald 's corporate headquarters and New York City office , on the 101st to the 105th floors of One World Trade Center in Lower Manhattan ( 2 to 6 floors above the impact zone of a hijacked airliner ) , were destroyed during the September 11 , 2001 attacks . At 8:46:46 a.m. , six seconds after the tower was struck by the plane , a Goldman Sachs server issued an alert saying that its trading system had gone offline because it was unable to connect with the server . Cantor Fitzgerald lost 658 of its New York employees , 68 % of its workforce , which was considerably more than any of the other World Trade Center tenants or the New York City Police Department , the Port Authority of New York and New Jersey Police Department , the New York City Fire Department , or the United States Department of Defense . Lutnick 's brother was among those killed as the stairwells below them were destroyed or blocked by the plane crash . Lutnick vowed to keep the company alive , and the company was able to bring its trading markets back online within a week
September 11 , 2001 attacks
September 11 attacks
Cantor Fitzgerald