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| | Drees & Sommer SE | Stuttgart |
| | Drees & Sommer SE | Hamburg, Bremen, Kiel, Hannover |
| | Drees & Sommer SE | Hamburg, Bremen, Kiel, Hannover |
| | Drees & Sommer SE | Erfurt, Leipzig |
| | KLEUSBERG GmbH & Co. KG | Wissen |
| | STRABAG Property and Facility Services GmbH | Düsseldorf |
| | Drees & Sommer SE | Frankfurt am Main |
| | STRABAG Property and Facility Services GmbH | Bremen |
| | Drees & Sommer SE | Reutlingen, Ensdorf |
| | INROS LACKNER SE | Rostock |
| | Drees & Sommer SE | Ulm, Freiburg, Mannheim, Karlsruhe, Frankfurt/Main |
| | Drees & Sommer SE | Stuttgart, Frankfurt am Main, Hamburg, Leipzig, München |
| | Drees & Sommer SE | Düsseldorf |
| | GOLDBECK Property Services GmbH | Hamburg |
| | Drees & Sommer SE | Stuttgart, Ulm, Freiburg, Mannheim, Karlsruhe |