| Zentrale: |
| Büro West: |
| Büro Ost: |
| Büro Nord: |
| Büro Mitte: |
| Maschmühlenweg 2 | |
| Volmerswerther Straße 20 | |
| Dunckerstr. 83 | |
| Ellerneck 61 | |
| Karlstraße 34 |
| 37073 Göttingen | |
| 40211 Düsseldorf | |
| 10437 Berlin | |
| 22149 Hamburg/Rahlstedt | |
| 64283 Darmstadt |
| Telefon | (0551) | 488 799-0 | |||
| Telefon | (0211) | 50 66 999-0 | |||
| Telefon | (030) | 47 37 27 9-0 | |||
| Telefon | (040) | 180 698 57 | |||
| Telefon | (0651) | 42 90 38-0 |
| Telefax | (0551) | 488 799-499 | |||
| Telefax | (0211) | 50 66 999-99 | |||
| Telefax | (030) | 47 37 27 9-99 | |||
| Telefax | (040) | 180 698 58 | |||
| Telefon | (0651) | 42 90 38-99 |