Why were the other buildings in the original World Trade Center complex very small, while the "Twin Towers" were very large?

The Twin Towers (1 and 2 WTC) were the main buildings of the original World Trade Center complex, and they were extremely large compared to the other buildings of the complex. Here's an example: Here's the height of the Twin Towers: 1 WTC (which was called the "North Tower") was 1,368 feet... show more The Twin Towers (1 and 2 WTC) were the main buildings of the original World Trade Center complex, and they were extremely large compared to the other buildings of the complex.

Here's an example:

Here's the height of the Twin Towers:
1 WTC (which was called the "North Tower") was 1,368 feet tall and had 110 stories.
2 WTC (which was called the "South Tower") was 1,362 feet tall and had 110 stories.

Now here's the height of the other buildings:
3 WTC (which was called "Marriott World Trade Center") was 242 feet tall and has 22 stories.
4 WTC (which was called the "South Plaza Building") was 118 feet tall and has 9 stories.
5 WTC (which was called the "North Plaza Building") was 118 feet tall and had 9 stories.
6 WTC (which was called the "US Customs House") was 105 feet tall and had 8 stories.
7 WTC (which was simply called "7 World Trade Center") was 610 feet tall and had 47 stories.
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