| 1992-1995 | Precursory office: Frenzen & Partner |
| | |
| 1995 | Leaving of the name-giving enterprise |
| | founder all business activities continued by |
| | M. Kutzborski and T. Rettinger |
| | |
| 1997/1998 | Trading under the new name |
| | Architekten Rettinger + Kutzborski GdBR |
| | |
| 2001 | Relocation to Nostitzstrasse 30 |
