In 2008, the owners of the World Trade Center released a 70-page report detailing major delays in the rebuilding process.
"This is the most complex construction program in the region's history and setbacks are inevitable," Port Authority Executive Director Christopher Ward wrote in a letter to then-governor David Paterson. By the time the report was released, the project had already exceeded its budget by $1 billion.
Michael Bloomberg, who was New York City's mayor at the time, expressed concern that the national memorial would not be complete by the 10th anniversary of the attack. Two years later, the memorial debuted on schedule, fulfilling the city's promise to the families of fallen victims.