What were the twin towers used for?

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Tags

1. #floor
2. #tenants
3. #which
4. #commonly
5. #provided
6. #columns
7. #trade
8. #walls
9. #framed
10. #center
11. #designed
12. #minoru
13. #plans
14. #brought
15. #buildings
16. #uninterrupted
17. #yamasaki
18. #world
19. #structures
20. #towers