More than a year after the crane collapse at 303 East 51st Street, which killed seven people, workers began demolition of unsafe portions of the building this week. The New York City Department of Buildings ordered removal of concrete balcony platforms on four floors that were damaged during the March 15, 2008, crane collapse. DOB spokesperson Kate Lindquist said the damaged balconies are not in immediate danger of falling, but have deteriorated badly over the past year. Demolition is expected to be completed by April 10, and the DOB’s stop-work order on the condo remains in effect. Owner James Kennelly has not filed revised plans with the Board of Standards and Appeals for the zoning variances needed to continue construction, and his lender reportedly has begun foreclosure proceedings for failure to pay more than $70 million, according to the Daily News.