Why was 6 WTC not included in the plans to rebuild the World Trade Center?

Question

In reading the Wikipedia article about the new World Trade Center, 6 WTC is conspicuously absent. It doesn't show up in the navigation sidebar:

And there's no mention of it in the list of planned or built buildings:

Each WTC building has a dedicated article that describes the original building and its replacement, but the article for 6 WTC makes no mention of its history after 9/11.

Someone noted the lack of 6 WTC on the talk page for the 6 WTC article in 2012, and someone else on the talk page for the main WTC article in 2016, but both inquiries went unanswered, and I can't find any mention of a "new" 6 WTC in my Google searches.

Why was 6 WTC never rebuilt, or had plans to be rebuilt?

Edit: since there seems to be random speculation in the comments and answer: 1 WTC, 2 WTC, 3 WTC are arbitrarily designated addresses. They do not indicate the physical location or the tenants that reside within the buildings:

• The new 1 WTC occupies the location of the old 6 WTC
• The new 2 WTC will occupy the location of the old 5 WTC
• The new 3 WTC occupies the space between the old 4 and 5 WTC
• The new 4 WTC is the only building that occupies the same space as the old building with the same name
• The new 5 WTC will occupy the same space as the Bankers Trust building
• The new 7 WTC occupies a portion of the old 7 WTC (the other portion being an extension of Greenwich St.)

As is the case with most office buildings, the tenants have significantly changed in all buildings since 9/11 and the owner of the complex is the Port Authority of New York and New Jersey: there is no obvious reason why 6 WTC would not be rebuilt simply because the previous tenants (New York Customs) would not renew their lease.

This question is specifically about why, given the buildings are numbered in sequential order and there is no significance to their naming other than 1 WTC, 6 WTC was skipped. In other words, why is there is 7 WTC but not a 6 WTC?

It feels like it should be obvious, but please only answer if you have an authoritative answer with a source backing your answer.

Answer 1

This isn't, strictly speaking, a question of history; merely one of logic and renumbering:

OLD : 1 2 3 4 - 5 6 7 -
NEW : M M M 4 3 1 2 7 5

• The site of the Old Twin Towers is currently occupied by the 9/11 Memorial & Museum, rather than by any (re)numbered towers.
• The site of the Old 5^th & 6^th Towers has been sacrificed to house the New Twin Towers.
• The 3^rd Tower has been reallocated within the former WTC area, albeit not at its former location, which is now part of the aforementioned memorial.
• The 4^th & 7^th Towers coincide in both numbering and location, leaving an empty 5^th & 6^th positions in the numbering scheme.
• The New 5^th & 6^th Towers would thus correspond to the fictitious locations of a previously non-existent Old 8^th & 9^th, thereby lying outside of the former WTC area.
• Since even the New 5^th is barely in its early preliminary stages, it is therefore not entirely surprising that there is currently no talk of a New 6^th.
• This could, theoretically, have been avoided by renumbering the New 7^th as a New 5^th, but that would have been superfluous, since they plan on (re)building it all anyway.

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Claims:

there seems to be random speculation in the comments and answer

This answer doesn't make any sense and indicates it's based on armchair speculation rather than any real evidence or authoritative source

Facts:

The new skyscraper stands [...] on the site of the original 6 World Trade Center.
— One World Trade Center.

it will occupy the position of the original 5 World Trade Center.
— 2 World Trade Center.

It is located [...] where the original nine-story 4 World Trade Center stood.
— 4 World Trade Center.

7 World Trade Center (7 WTC or WTC-7) refers to two buildings that have existed at the same location within the World Trade Center site in Lower Manhattan, New York City. The original structure, part of the original World Trade Center, was completed in 1987 and was destroyed in the September 11 attacks in 2001. The current structure opened in May 2006.
— 7 World Trade Center.

5 World Trade Center [...] is a planned skyscraper at the World Trade Center in Lower Manhattan, New York City.
— 5 World Trade Center.

Answer 2

It is possible that there is no room for WTC 6 but it seems a impossible for there to be no room for 6 WTC since there is room near 5, and I read the wiki article for the performing arts center and (as of late 2022) it says that the performing arts center is also called WTC 6, so 6 WTC can be build near 5 and is not talked about yet or performing arts center is 6 WTC with a different name. (WTC 6 could also be the Transportation Hub, but to me is highly doubtful.)

Evidence WTC 6 could be the performing arts center: https://en.wikipedia.org/wiki/Performing_Arts_Center_at_the_World_Trade_Center

Answer 3

I think it has to do with ownership rights of each space: Port Authority owns Tower 1 and the transportation hub, Silverstein Properties owns 2,3, 4 and 7, the Arts Center got named after a big donor, etc. At some point someone thought a 6 would be built.