Unlike the common through La Defense is not the CBD of Paris nor its biggest business district.
The biggest business district of Paris is called QCA (Quartier Central des Affaires), it has 8 million m²
90 million sq ft of office and 400,000 employements, it is the biggest business district in Europe along with London City.
http://www.webimm.com/statistique/zonesgeo.asp
Well this first part will show a rather homogenious architecture, but don't be fooled the architecture is diverse in this district, this part is not the best exemple to prove it.
Many building look old but infact were building in the from last decade to nowaday.
This method is called facadism, they destroy an old building but they let the old facade and they build a new building inside.
I am not a big fan of this method I prefer to have a modern looking building.
Don't worry there is also building with modern facade in QCA.
There is places that I have already showed and many new places that I did not even knew before.
1. We begin at Pyramides, the place where stop my bus.

2. Avenue de L'Opera, maybe the last busy important way in Central Paris, see the first Starbucks in our trip.

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4. I love Opera, interresting name for a tendy restaurant, quite empty because these picture were took before 12 p.m.

5. The Avenue de l'Opera is architecturally homogenious but it is not the case of the whole QCA.

6. According me the avenue lacks of glassy buildings.

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9. Even in Opera district there is some glassy building.

10. I like this red brick building.

11. Avenue de L'Opera, homogenious with many fake old buildings but beautiful.

12. Brasserie, Japanese restaurants, Chinese restaurants, Korean restaurants, Italian restaurants, north afriacn restaurant, Kebab, and some french restaurants I like the diversity.

13. Incredible, people on the Avenue de l'Opera I joke it is common on working day and due at tourists.

14. Fake old building, infact only the facade is historical, the building inside was built in the 1990's 2000's

15. Rue Louis le Grand

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19. Rue du Quatre Septembre

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24. Boulevard des Capucines, empty here but crowded in lunch time

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27. Well second, I like its facade.

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29. Intersection with Avenue de l'Opera

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34. I hesitated to post this picture because it look too touristy, this is a little bonus.

35. The famous Rue de la Paix with the Place Vendome.

36. Crossing

37. Another crossing. It is green but it is not a Starbucks.

38. We continue in the Boulevard des Capucines.

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42. They tried to build a glassy building in Parisian old style, if you want my opinion they failed

, a fully modern style building would a way better.

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44. Rue Scribe.

45. Old England.

46. Rue Daunou.

47. Alway in Boulevard des Capucines

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49. Oh the beautiful 1910's facade.

50. Now if we look inside, oh the quite nice 1990's office buildings.

51. It look authentic, I don't know how many people fall into this trap when they go in Paris because it is really frequent.

52. Here it is authentic.

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54. This complex is quite empty, maybe busier in lunch times.

55. Fine English Furniture : Paris - Brussels.

56. Rue Auber

57. Sorry for the bad quality, entrance of RER A Auber station.

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59. Rue Boudreau

60. Revoila Boulevard des Capucines.

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62. The Famous Olympia.

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64. A new building with a 1930's facade u/c, well soon clompleted

65. Rue Caumartin.

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67. Rue des Capucines.

68. Boulevard des Capucines.

69. Rue de Seze, maybe you may not notice it.

70. Third...
To be continued with many other pictures and far more....