Editing Tour Montparnasse (section)

===Construction===
[[File:Highpoints of Paris.svg|upright=1.5|The Tour Montparnasse in comparison to other tall structures in Paris|thumb]]
The Tour Montparnasse was built between 1969 and 1973 on the site of the old Montparnasse station. The first stone was laid in 1970 and the inauguration took place in 1973.

The foundations of the tower are made up of 56 reinforced concrete pillars sinking {{convert|70|m|abbr=on}} underground. For urban planning reasons, the tower had to be built just above a Metro line; and to avoid using the same support and weakening it, the Metro structures were protected by a reinforced concrete shield. Long horizontal beams were installed in order to free up the space needed in the basement to fit out the tracks for trains.<ref>{{Cite web |last=Batiactu |date=11 March 2008 |title=L'histoire de la tour Montparnasse |url=https://www.batiactu.com/edito/histoire-tour-montparnasse-20594.php |access-date=23 May 2021 |website=Batiactu |language=fr}}</ref>