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 | | P.J. Ingenieurgesellschaft mbH | Burgdorf, Neuenhagen bei Berlin |
 | | Berlin TXL Management GmbH | Berlin |
 | | Drees & Sommer SE | Stuttgart, Hamburg, Köln, Leipzig, Berlin, Düsseldorf, München, Frankfurt a.M. |
 | | TPLAN Ingenieurgesellschaft mbH | Berlin |
 | | GPlant GmbH Ingenieurgesellschaft | Berlin |
 | | STRABAG Property and Facility Services GmbH | Berlin |
 | | STRABAG AG | Berlin |
 | | Drees & Sommer SE | Stuttgart, Frankfurt, Dresden, Leipzig, Berlin, Hamburg |
 | | GOLDBECK Technologies GmbH | Bielefeld, Leipzig, Treuen, Berlin |
 | | Ed. Züblin AG | Berlin |
 | | INFRAFACT GmbH | Bochum, Berlin |
 | | Drees & Sommer SE | Stuttgart, Hamburg, Berlin, Leipzig, Köln, Düsseldorf, Frankfurt, München |
 | | Drees & Sommer SE | Stuttgart, Köln, Düsseldorf, Aachen, Berlin, Frankfurt |
 | | Apleona GmbH | Berlin |
 | | STRABAG Property and Facility Services GmbH | Berlin |