David Dunlap of the New York Times reports on the construction of the Freedom Tower:
One World Trade Center, also called the Freedom Tower, broke through the street-level barrier on Saturday when workers for DCM Erectors attached new sections atop two of the 24 jumbo columns that form the building’s perimeter. The additional steel brought the columns to a height of about 15 feet above grade. The authority said the 22 other columns were expected to sprout through May, June and July. Tishman Construction Corporation is the construction manager for the project, which is to be completed in 2012.