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| | STRABAG AG | Hamburg, Bebra (Hessen) |
| | ZETCON Ingenieure GmbH | Hamburg |
| | Drees & Sommer SE | Hamburg, Hannover, Berlin |
| | Drees & Sommer SE | Stuttgart,Karlsruhe,München,Frankfurt,Köln,Berlin,Leipzig,Hamburg |
| | Drees & Sommer SE | Stuttgart, Frankfurt am Main, Hamburg, Leipzig, München |
| | AUG. PRIEN Bauunternehmung (GmbH & Co. KG) | Hamburg |
| | STRABAG Property and Facility Services GmbH | Hamburg |
| | Köster GmbH | Hamburg |
| | Drees & Sommer SE | Stuttgart, Frankfurt, Hamburg |
| | STRABAG Property and Facility Services GmbH | Hamburg |
| | SOLARIMO GmbH | Berlin, Essen, München, Stuttgart, Hamburg |
| | Drees & Sommer SE | Stuttgart, München, Frankfurt, Köln, Hamburg, Berlin, Leipzig, Dresden |
| | Drees & Sommer SE | Stuttgart, Frankfurt, Hamburg |
| | Diederichs Projektmanagement AG & Co. KG | Hamburg |
| | GOLDBECK Property Services GmbH | Hamburg |