May 20, 2010 11:04 pm Meet New York's Worst Buildings Tracking down New York City‘s most notorius slumlords can be tough. But there is renewed focus on the worst violators. Local 5:34 VIDEO: Columbia University protesters takeover Hamilton Hall 3:01 I-Team: NYPD officers testify in surveillance video controversy 1:59 2 suspects charged with murder in Long Island body parts case 2:35 Extra NYPD patrols in Central Park after series of violent crimes 3:01 Columbia begins suspending students after protesters defy deadline