the pentagon memorial was built adjacent to the building. the rebuilding process has started on the world trade center site. in 2006, a new office tower was completed on the site of 7 world trade center. the new one world trade center was later built and was completed in 2014. three more towers were originally expected to be built between 2007 and 2012 on the site, but are now delayed to 2018. ground was broken for the flight 93 national memorial on november 8, 2009, and the first phase of construction is expected to be ready for the 10th anniversary of the attacks on september 11, 2011.