 The building is being promoted as the safest skyscraper in the U.S. According to Silverstein Properties , the owner of the building , it " will incorporate a host of life @-@ safety enhancements that will become the prototype for new high @-@ rise construction " . The building has 2 @-@ ft ( 60 cm ) -thick reinforced @-@ concrete and fireproofed elevator and stairway access shafts . The original building used only drywall to line these shafts . The stairways are wider than in the original building to permit faster egress . 
