| Ernest Cognacq - Founder of the department stores | Project sponsor with Marie-Louise Jay. |
| Marie-Louise Jay - Founder of the Grands Magasins | Project sponsor with Ernest Cognacq. |
| Frantz Jourdain - Senior Architect | Manufacturer of the building and stairway. |
| Georges Bourneuf - Collaborating architect | Helped Jordan during the works. |
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