Workers on began taking apart a black-shrouded, ruined skyscraper that has languished above ground zero since the Sept. 11 terrorist attacks. Construction workers started removing Friday metal column covers and glass windows on the top four floors of the former Deutsche Bank AG building, which was permanently damaged when the World Trade Center's south tower tore a 15-story gash into it on Sept. 11, 2001. "I'll be happy to see it gone," said Sandy Gant, who has looked outside his 10th-floor apartment at the vacant, 41-story tower since the attacks. "It'll improve my view a little bit." The deconstruction of the building has been one of the most complex in the city's history because environmental regulators had to improve a floor-by-floor plan to clean out the building of asbestos, lead, toxic trade center dust and other toxins.