From 911blogger.com, a site for in depth news about 9/11.
Turner Construction, who supervised the 2000 demolition of the Seattle Kingdome, participated in the post-9/11 Ground Zero clean-up and performed extensive renovations within the World Trade Center towers just prior to 9/11, was in fact performing unspecified renovation work 
throughout the WTC complex until the very morning of September 11, 2001. The Port Authority of NY/NJ now claims that records describing such work or other projects were destroyed on September 11, 2001. A December 2000 WTC property assessment described required renovation work to be completed within one year, upon steel columns within elevator shafts of both WTC towers that was immediately pending or already underway.
Terror devastates A/E/C firms
12 employees of Turner Construction were located in an office in the third subbasement of Tower 1, the north tower. Turner had been performing renovation work in various parts of the center and had occupied various office spaces.
https://www.highbeam.com/doc/1G1-79439506.htmlIn 1997 Turner Construction also constructed the new headquarters for the Naval Sea Systems Command (NAVSEA). The Indian Head Naval Surface Warfare Center, a laboratory managed by NAVSEA was described during the 1990s as the “National Center for Energetics”, the “Pentagon’s jargon to broadly describe explosive materials, propellants and pyrotechnics” and as the “only reliable source of aluminum nanopowders in the United States”.
https://www.highbeam.com/doc/1P2-574412.htmlTurner Corporation 1997 10-K Report
During 1997, the company completed work on … the Naval Sea Systems Command Headquarters (NAVSEA) for the Navy in Washington, DC.
https://www.buck.com/10k?tenkyear=97&idx=T&co=!TURNERC&nam=DEMO2&pw=DEMO2Naval Sea Systems Command
https://en.wikipedia.org/wiki/Naval_Sea_Systems_Command The Top Ten Connections Between NIST and Nano-Thermites
https://www.journalof911studies.com/volume/2008/Ryan_NIST_and_Nano-1.pdfPrevious work performed by Turner Construction at the WTC included fireproofing of the only floors that were struck by United and American airlines flights on September 11, 2001 and that later burned and “failed”.
https://www.911blogger.com/node/13272A December 2000 WTC property assessment recommended immediate renovation work upon steel columns contained within elevator shafts of both WTC towers:
https://www.911blogger.com/node/19680The Port Authority of NY/NJ claims that contracts with Turner Construction – including those that might describe the renovation work being performed by Turner Construction until the very morning of September 11, 2001 – were destroyed on September 11, 2001.
However, Port Authority records detailing other work performed by Turner Construction and requested by NIST during its investigation of the WTC building collapses, were not destroyed on September 11, 2001.
https://www.911podcasts.com/files/documents/NIST-Fireproofing.zipTurner Construction Company occupied the 38th floor of WTC 1.
List of Tenants in One World Trade Center
https://en.wikipedia.org/wiki/List_of_tenants_in_One_World_Trade_CenterTurner Construction particpated in the collection and disposal of the steel wreckage of the WTC towers following September 11, 2001.
Australia’s Lend Lease has secured the contract to manage the clean-up operation at New York’s World Trade Center site … will also be in charge of AMEC Construction Management, Turner Construction and Tully Construction, which have been contracted to work on the site.
https://www.highbeam.com/doc/1G1-81303508.htmlThe CEO for Turner Construction Company appointed in 1999, was Tom Leppert, who joined the board of Turner in 1998, is currently the mayor of Dallas, Texas and who has ties with former president George W. Bush and Carlos M. Gutierrez, Secretary of the U.S. Department of Commerce. The National Institute of Standards and Technology, a bureau of the Department of Commerce, was assigned to investigate the collapses of the WTC 1,2 and 7.
Thomas C. Leppert Named To Succeed E.T. Gravette, Jr. As Chairman Of The Turner Corporation
https://www.turnerconstruction.com/corporate/content.asp?d=1222&p=1153PRESIDENTIAL APPOINTMENT FOR MAYOR LEPPERT
President George W. Bush appointed Dallas Mayor Tom Leppert to the President’s Commission on White House Fellows.
https://www.tomleppert.com/PR/docs/fellows_commission.pdfMayor Leppert meets with Bush
Dallas Business Journal
Dallas Mayor Tom Leppert, along with a group of 11 other mayors, met with President George W. Bush and Commerce Secretary Carlos M. Gutierrez Wednesday at the White House to discuss a free trade agreement with the South American countries of Peru and Colombia.
https://www.bizjournals.com/dallas/stories/2008/01/21/daily26.html?jst=m_…Carlos M. Gutierrez
https://www.commerce.gov/bios/Gutierrez_bio.htmNIST and the World Trade Center
https://wtc.nist.gov/
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Related:
911 Mysteries Part 1 – Demolitions (Full – 1ed.), a documentary about the evidence that shows that WTC 1, 2 and 7 were demolished. (91 mins).