- 14 Companies at the address Elisabethstraße 2, 50226 Frechen
- ABG Systems GmbH- Frechen - IT (J62) 
- B.K. Baumanagement GmbH- Frechen - Handwerk (F43) 
- BECO Group GmbH- Frechen - Real estate (L68) 
- Brockhaus & Kollegen Rechtsanwaltsgesellschaft mbH- Frechen - Auditors, tax consultants, lawyers (M69) 
- DC Consulting UG (haftungsbeschränkt)- Frechen - Management and consultancy services (M70) 
- Euro I. D. Identifikationssysteme GmbH & Co. KG- Frechen 
- Euro I.D. Beteiligungen GmbH- Frechen - Holdings and financial services (K64) 
- Frechen Campus Facility Management OHG- Frechen - Real estate (L68) 
- Frechen Campus Real Estate OHG- Frechen 
- Frechen City Construction und Venture Capital OHG- Frechen 
- Frechen City Investment und Construction OHG- Frechen 
- Frechen City Investment und Development OHG- Frechen 
- Germany Campus Entwicklungs GmbH & Co. KG- Frechen - Real estate (L68) 
- Neue Hofgärten Entwicklungs GmbH & Co. KG- Frechen - Building construction (F41)