to make the construction process more efficient. The Port Authority was set to complete underpinning and excavation under the tunnel structure by the second quarter of 2010, and start basic construction of the Cortlandt Street station during the 3rd quarter. In the second quarter report for 2010, the Port Authority of New York and New Jersey confirmed that excavation under the tunnel structure of the World Trade Center site was nearly complete, and that construction of the Cortlandt Street station would begin during the third quarter of 2010. Station finishes were set to start during the second quarter of 2011, and work began on the station mezzanine and platforms in September 2011. The tracks were walled off for the protection of the workers while the construction progressed. From 2008 to 2011, the used an enclosed structure for a short distance when passing the site of the station, as a result of the massive excavation in the World Trade Center site. When the site was filled back in, the developers of the new World Trade Center rebuilt Cortlandt Street across the site as one of the primary roads, resulting in the rebuilt Cortlandt Street station again serving its namesake. Disputes between the PANYNJ and the MTA over who would pay for the renovation had caused the planned opening of the station to be delayed from 2014 to 2018. In 2013, the PANYNJ awarded a contract to rebuild the station. The first phase of the demolition of the original station cost $19 million. The area was still being rebuilt in December 2013, and in February 2015, the PANYNJ and the MTA agreed to finish the station. The part of the Broadway–Seventh Avenue Line on which the Cortlandt Street station is located, south of Chambers Street, was intermittently closed between May 2015 and 2018. This allowed construction at the station, which included station finishes, tiles and lighting, to resume. MTA rebuild The MTA gained control of the Cortlandt Street station's reconstruction project in 2015. However, in January 2017, an independent engineer for the MTA said that the station's reopening could potentially be pushed back due to disagreements with station contractor Judlau Contracting. At that time, the MTA had spent $800,000 per month on the project, but it would need to spend four times as much money in order to meet the projected August 2018 deadline. The PANYNJ agreed to grant the MTA "full