Groundbreaking on the massive rebuilding project at Ground Zero in New York may be delayed by a peripheral fight over money. There had already been reports that architect Daniel Libeskind and developer Larry Silverstein had been at odds over various details of the project. Now, Silverstein’s personal financial battles with the Port Authority and his mortgage company are putting the construction timetable in doubt. “Each of the three warring parties has significant say over how insurance proceeds from the twin towers are used. But Silverstein is insisting that the timetable for the 1,776-foot Freedom Tower will be delayed unless his lender – GMAC Commercial Mortgage Corp. – is bought out, sources said.”