Officials say the completion of the building will be the final milestone in the commercial buildout of the World Trade Center campus.
The two fell from the J train as it crossed from the Williamsburg Bridge into Manhattan just before 6 p.m.
There are major changes ahead for the more than 900,000 students in New York City Public Schools, that will come from both inside, and outside the classroom.
Videos from the scene show the car quickly being consumed by the fire as onlookers waited for the fire department to arrive.
For the past 24 years there have been six moments of silence, to mark the times when planes struck in New York, Washington and Pennsylvania, and when towers fell, followed by six tolls of a bell.
As the United States approaches the 250th anniversary of its founding, church leaders say Trinity's history mirrors the resilience of both New York City and the nation itself.